US3884144A - Compact printer - Google Patents

Compact printer Download PDF

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Publication number
US3884144A
US3884144A US372563A US37256373A US3884144A US 3884144 A US3884144 A US 3884144A US 372563 A US372563 A US 372563A US 37256373 A US37256373 A US 37256373A US 3884144 A US3884144 A US 3884144A
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US
United States
Prior art keywords
print
drive shaft
carrier
print carrier
spring
Prior art date
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
Application number
US372563A
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English (en)
Inventor
Tadayoshi Shimodaira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP6179572A external-priority patent/JPS5223288B2/ja
Priority claimed from JP10994172A external-priority patent/JPS4968825A/ja
Application filed by Suwa Seikosha KK filed Critical Suwa Seikosha KK
Application granted granted Critical
Publication of US3884144A publication Critical patent/US3884144A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/48—Type carrier arrested in selected position by electromagnetic means

Definitions

  • one end [51] gl 99 of the driven means is connected to the print carrier [58] o earc 6 6 6 and the other end thereof is movably mounted on the driven shaft and accessible to the notch provided therein.
  • displaceable print means [5 6] References cued for imprinting a selected character carried on the print UNITED STATES PATENTS carrier on an imprint receiver and means for aligning 3,169,474 2/1965 Howard 101/1 10 a selected character carried on the print carrier in the 3,307,676 3/1967 Hickerson 101/110 X print means path 3,422,754 1/1969 Bakardjiev et al.... 101/99 X 3,664,259 5/1972 Weinkle lOl/99 6 Claims, 8 Drawing Figures PATENI HAY 2 0 I975 SHEET 10F 3 PRIOR ART PATENTEUmzoms 3,884,144
  • This invention relates to an improved compact printer of the type utilized in electronic desk calculators and other numerical read out devices. More particularly, this invention relates to novel means for print selection and means for resetting the print carrier after selection.
  • Prior printers include a plurality of concentric axially arranged print wheels which may be frictionally rotated for obtaining a selected print character arrangement.
  • the number of print wheels employed is determined by the number of print columns desired.
  • Print characters including letters, numerals, functional signs and the like are conventionally arranged in columnar fashion on the periphery of each print wheel.
  • each print wheel of the plurality is rotatable for obtaining a selected array of characters.
  • the oriented selected array is thereafter striken with a print hammer, for instance a platen, to effect an imprint thereof on a paper receiver, for example, interposed therebetween.
  • the instant invention provides a simply constructed, compact printer which performs with a minimum of noise.
  • Low noise level performance is a much sought after characteristic in view of recent noise pollution studies here and abroad.
  • the instant invention provides a novel arrangement for aligning the print characters and effecting an imprint.
  • an improved compact printer which includes a rotary drive shaft having a notch therein, one or more print carriers carrying one or more print characters on the periphery thereof rotatably mounted on the drive shaft, and a discrete driven means for rotating each carrier through print selection and reset sequences.
  • An end of the driven means is connected to a corresponding print carrier, while the other end thereof is moveably mounted on the drive shaft accessible to the notch provided therein.
  • displaceable print means for imprinting a selected character carried on a print carrier on an imprint receiver and means for aligning a selected character carried on a print carrier in the print means path.
  • a plurality of print carriers coequal with the number of print columns desired are axially arranged on the rotary drive shaft and driven thereby through the intermediate driven means which links each discrete print carrier to the drive shaft.
  • Lead rotation of the drive shaft causes a lag rotational sequence in the print carrier through the driven means.
  • the rotational sequence may be interrupted when a selected character carried on the print carrier is aligned in the print means path. After the selected character is striken by print means the drive shaft may be rotated in the reverse direction for resetting the print carrier prior to a next successive selection sequence.
  • FIGS. 1 and 4 are side elevational views of prior art embodiments
  • FIG. 2 is a side elevational view of one compact printer embodiment constructed in accordance with the invention.
  • FIG. 3 is an exploded perspective of a detail of the embodiment shown in FIG. 2;
  • FIG. 5 is a side elevational view of another compact printer embodiment constructed in accordance with the invention.
  • FIG. 6 is a fragmentary sectional view of a detail of the embodiment taken along the line AA in FIG. 5;
  • FIG. 7 is a schematic representation showing the manner of operation of the compact printer embodiment shown in FIG. 5;
  • FIG. 8 is a cutaway view of yet another embodiment of the invention.
  • FIG. 1 there is shown a prior art embodiment wherein a plurality of print wheels 1 are axially arranged on a common shaft 3. Each print wheel is provided with a concentric. axially arranged pinion 4. A peripheral segment of a sector lever 5 is provided with a plurality of teeth 6 adapted to mesh with pinion 4, while a substantially adjacent segment thereof is provided with a plurality of saw-blade teeth 7 which cooperate with a print character selection lever 11 pivotably mounted for selective engagement and disengagement therewith.
  • Sector lever 5 is pivotably mounted on a shaft 8 and is tofque driven into mesh with pinion 4 by a spring bias 10 having an end connected thereto and a second fixed end.
  • Oscillating rod 9 oscillates through a weighted arc in sector lever 5 for reciprocating sector lever 5 through a selected moment in cooperation with spring 10.
  • a spring 12 normally biases print character selection lever 11 for frictionally engaging saw teeth 7 of sector lever 5.
  • a displaceable print hammer 14 Aligned with the selected print character is a displaceable print hammer 14 for striking an imprint of the selected character on an interposed imprint receiver 15, for instance a paper of selected bond, through an ink ribbon 16.
  • Prior printers of the type described are defect prone because character selection is gear determined. For instance. printed characters are commonly of scattered height since the selected character is irregularly oriented in the print display position, i.e. characters are not constantly positioned in the hammer strike path, due to gear backlash and the like.
  • FIG. 4 there is shown another prior printer embodiment wherein a plurality of print wheels 102 with peripherally arranged characters 103 are axially arranged and rotatably mounted on shaft 101.
  • a description of one print wheel and its mode of operation will serve as a description for all.
  • Fixedly mounted on shaft 101 for rotation therewith is spring washer 105 axially arranged and frictionally engaging print wheel 102 for rotating print wheel 102.
  • a radially located stop pin 107 transversely mounted on print wheel 102 cooperates with stopper 108 for fixing the rest position of print wheel 102.
  • a displaceable print hammer effects an imprint of a selectively displayed character on an interposed imprint receiver 110 through an ink ribbon 111.
  • Spring biased, pivotably mounted print character selection lever 112 may be pivoted by the action of an electromagnet 113 for engaging print wheel 102 along a groove 104 thereof for thereby holding and displaying a selected print character 103 in a print position.
  • Spring 114 resets selection lever 112 to a rest position when electromagnet 113 is inactive.
  • print wheel 102 rotates counterclockwise through a character selection sequence at an advance speed determined by the applied frictional force of spring washer 105.
  • the applied frictional force corresponds with the distortion of coacting spring washer 105 and the gap distance between adjacent, axially arranged print wheels mounted on shaft 101.
  • Dimensional variations among print wheels varies applied frictional forces and requires upward adjustment thereof with concommitant excess power consumption.
  • Spring washer 105 frictionally engages print wheel 102 until the selection sequence ends or until spring washer 105 rotates approximately 360 and while selection lever 112 cooperates with groove 104 to display a selected character. Therefore, print wheel 102 carries a large load torque and a large power source must be employed to provide the necessary startup energy required for the selection sequence.
  • print wheel side walls are defaced and wear under the frictional force applied thereto and correspondingly, the frictional force applied thereto varies.
  • a rotary drive shaft is provided with a peripheral notch located in the thrust direction thereof.
  • One or more axially arranged, concentric print carriers, for instance a plurality of print wheels 22, are rotatably mounted on drive shaft 20.
  • Each print wheel 22 is provided with peripherally arranged characters 23 and a coaxial, radially extending ratchet wheel 24 provided with a planar projection, stopper 25.
  • Surrounding drive shaft 20 is sleeve 26 channeled to permit access to notch 21 provided in drive shaft 20.
  • a means 27, for instanct a resilient spring member, is housed in an annular concentric recess provided in print carrier 22.
  • An end of means 27 is fixedly connected to print carrier 22 and the other end thereof is a free end which may ride and frictionally engage the notched surface of drive shaft 20.
  • means 27 As drive shaft 20 rotates in a counterclockwise direction, means 27 is driven thereby for rotating print carrier 22 in a corresponding counterclockwise direction.
  • means 27 is frictionally driven thereby or driven thereby be cooperative notch 21 for rotating print carrier 22 in a corresponding clockwise direction.
  • a selected print character 23 may be displayed in the strike path of a print hammer 34 as print carrier 22 advances through a print character selection sequence by coacting elements 28 to 32.
  • a reciprocable lever 28 pivotably mounted on a pin 30 is provided with a pawl end 29 normally positioned for stopping the rotational advance of print carrier 22.
  • An end of reciprocable lever 28 is provided with a conductive face plate operatively aligned with electromagnet 33.
  • a reset spring 31 normally biases reciprocable lever 28 against pivot stop member 32.
  • Displaceable print hammer 34 is positioned for striking a selected character for obtaining an imprint thereof on an imprint receiver 35 through an ink ribbon 36.
  • drive shaft 20 is rotated counterclockwise for thereby rotating print carrier 22 in a counterclockwise direction through the frictional action of driven member 27 against notched drive shaft 20.
  • electromagnet 33 is actuated, by means not shown when the selected character is arranged in' the print position opposite the print hammer 34.
  • the conductive face plate of reciprocable lever 28 is attracted to electromagnet 33 and reciprocable lever 28 pivots for engaging pawl end 29 with teeth of ratchet 24 for thereby halting rotation of print carrier 22.
  • print hammer 34 is actuated, by means not shown, for striking imprint receiver 35 and ink ribbon-36 intovthe selected character 23. While the rotational advancesof pattern carrier 22 is halted, notched drive shaft 20 continues to rotate counterclockwise and means 27 now unseated from drive shaft notch 21 frictionally engages the drive shaft periphery. 'The frictional torque imparted to means 27 is translated to a counterclockwise moment in pattern carrier 22 which drives ratchet 24 against pawl end 29 for thereby constantly maintaining the position of selected print carrier 23 in the strike path of print hammer 34.
  • a rotary drive shaft 120 is provided with a peripheral notch 121 located in the thrust direction thereof.
  • One or more axially arranged, concentric print carriers, for instance a plurality of print wheels 122, are rotatably mounted on drive shaft 120.
  • Each print wheel 122 is provided with peripherally arranged characters 123 and a coaxially, radially extending ratchet wheel 124 provided with a planar projection, stopper 125.
  • Surrounding drive shaft 120 is a sleeve 127 provided with a channel 126 for permitting access to notch 121 in drive shaft 120.
  • a means 129 for instance a resilient spring member, is housed in an annular concentric recess 128 provided in print carrier 122.
  • An end of means 129 carries an integral projection 141 freely carried in notch 121 while the printer is at rest.
  • Another end of means 129 is fixedly connected to the interior peripheral wall of ratchet 124.
  • Means 129 is elastically deformable and the portion thereof carrying projection 14] projects toward the interior pattern carrier wall defining recess 128.
  • a selected print character 123 may be displayed in the strike path of a print hammer 138 as print carrier 122 advances through a print character selection sequence by coacting elements 130 to 137.
  • a reciprocable lever 130 pivotably mounted on a pin 131 is pro vided with an at rest position determined by lever stop 132.
  • a torsion coil spring 133 fixedly connected at one end to reciprocable lever 130 and at its other end fixedly connected to axle pin 134 mounted on the printer frame, not shown, determines stable rest and operating positions for reciprocable lever 130. Facing an electromagnet 135, actuable by means not shown, is a conductive face plate 136 mounted on reciprocable lever 130 oppositely from electromagnet 135.
  • a reset bar 137 is oscillatable between first and second positions for resetting reciprocable lever 130 from an operating position to a rest position.
  • a selected character 123 is arranged in the strike path of a print hammer 138 and print hammer 138 is actuated by means not shown for striking imprint receiver 139 and ink ribbon 140 against the selected character 123 for securing an imprint thereof on imprint receiver 139.
  • a coded print command is relayed to the printer by means known to the art and simultaneous therewith drive shaft 120 rotates clockwise for thereby starting a character selection sequence.
  • Pattern carrier 122 is advanced clockwise through a character selection sequence by means 129 driven by drive shaft 120. instantaneously before selected character 123 is arranged in print position, a pulse-like voltage is applied,
  • Lever 130 is provided with a pawl end engageable with teeth of ratchet 124 for halting the clockwise advance of pattern carrier 122 and arranging selected character 123 in a stable, constant print position.
  • Torsion coil spring 133 maintains lever 130 in position in relative engagement with ratchet 124 during current interruptions through electromagnet 135.
  • Print carrier 122 may be advanced clockwise substantially 360 whereat an empty character position is located in the print hammer strike path. There may be occasions where a particular printout is of fewer columns than may be provided in terms of the printer capability.
  • frictional'drag exerted on a resilient spring member by a rotating drive shaft is employed for rotating a print carrier.
  • the frictional force which has to be developed for rotating each discrete print carrier is independent of the number of print carriers axially arranged on the drive shaft and a constant frictional torque may be applied to each discrete print carrier without regard forthe number employed. It is found that large or small frictional torques may be selectively developed for rotating the print carrier by selectively carrying an end of the resilient spring member in the drive seat type notch provided in the drive shaft or by dragging that end thereof along the surface of the drive shaft.
  • the resilient spring member may be housed in a narrow recess provided in the print carrier and wound about the drive shaft, a small diameter print carrier may be provided therefore and the size of the unit may be reduced. It is critical however that the drive shaft be of sufficient diameter that it will not deform under the pressure of the resilient spring member. In view thereof, it is also desirable that the character print strike position be offset from the notch provided in the drive shaft. This feature is best seen in FIG. 7, where it may be observed that a print hammer strike of force F may be of sufficient impact to exert an impact force against drive shaft 120. It is therefor desirable that the notched portion of the drive shaft be maintained outside the force field thereby developed.
  • FIG. 5 shows yet another embodiment of the invention wherein the resilient spring member is differently arranged. Yet other arrangements within the scope of the invention may occur to the art skilled.
  • the resilient spring member employed herein may be fabricated of spring steel, plastic or any other material with the performance characteristics herein described. It is also contemplated that the resilient spring member may be integrally formed with the print carrier.
  • a compact printer comprising a rotary drive shaft having an axially extending notch therein, said drive shaft being rotatable in first and second directions, at least one print carrier carrying at least one print character on the periphery thereof rotatably mounted on said drive shaft, said at least one print carrier being rotatable in firstand second directions corresponding to said rotary drive shaft, a resilient spring for rotating said at least one print carrier through print selection and reset sequences, respectively, corresponding to said first and second directions thereof, said spring being driven by said notched drive shaft, said spring having a fixed end and a free end, said fixed end of said spring being fixedly connected to said at least one print carrier, said free end of said spring having an elbow releasably engageable in said drive shaft notch, said notch in said drive shaft providing a drive seat for said free end of said spring for said shaft to thereby drive said spring, displaceable print means for imprinting a selected character carried on said at least one print carrier on an imprint receiver, and means for selectively releas
  • said looking means includes a ratchet wheel connected to said at least one print carrier, a reciprocable lever carrying a pawl at an end thereof engageable with teeth of said ratchet wheel and means for selectively reciprocating said reciprocable lever at the conclusion of a print cycle, said drive shaft continuously rotating in said first direction until a print is effected and said ratchet wheel and pawl end of said reciprocable lever being cooperable for locking the position of said print carrier against the driving action counter force thereof for stabilizing the position of a displayed print character in the path of said displaceable print means.
  • the compact printer of claim 1 including an annular, concentric recess provided in said at least one print carrier for housing said spring, and a sleeve surrounding said drive shaft, said sleeve permitting access to said notch in said drive shaft.
  • the compact printer of claim 1 including means for driving said drive shaft in said first and second directions according to a selected print command, said spring and print carrier being correspondingly rotated in said first and second directions in phase with the said drive means.
  • the compact printer of claim 1 including means for resetting said print carrier at the conclusion of a print selection sequence.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
US372563A 1972-06-22 1973-06-22 Compact printer Expired - Lifetime US3884144A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6179572A JPS5223288B2 (de) 1972-06-22 1972-06-22
JP10994172A JPS4968825A (de) 1972-11-02 1972-11-02

Publications (1)

Publication Number Publication Date
US3884144A true US3884144A (en) 1975-05-20

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ID=26402874

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Application Number Title Priority Date Filing Date
US372563A Expired - Lifetime US3884144A (en) 1972-06-22 1973-06-22 Compact printer

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US (1) US3884144A (de)
DE (1) DE2331957C3 (de)
FR (1) FR2190059A5 (de)
GB (1) GB1404292A (de)
IT (1) IT986196B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033256A (en) * 1974-05-09 1977-07-05 Kabushiki Kaisha Suwa Seikosha Printer
US4054089A (en) * 1974-12-27 1977-10-18 Copal Company Limited Line printer
US4152982A (en) * 1976-07-21 1979-05-08 Kabushiki Kaisha Suwa Seikosha Miniature printer
US4161912A (en) * 1976-06-04 1979-07-24 Shinshu Seiki Kabushiki Kaisha Miniature printer
US4164181A (en) * 1974-05-09 1979-08-14 Kabushiki Kaisha Suwa Seikosha Printer
US4165687A (en) * 1976-05-22 1979-08-28 Kabushiki Kaisha Suwa Seikosha Printing equipment and method of operation thereof
US4262593A (en) * 1977-07-29 1981-04-21 Henry Gross Printing apparatus
US4270448A (en) * 1977-07-06 1981-06-02 Kabushiki Kaisha Suwa Seikosha Printing device
US4276824A (en) * 1978-03-21 1981-07-07 Pitney Bowes Deutschland Gmbh Driving and braking system for an electronic embossing machine
US4291620A (en) * 1978-09-27 1981-09-29 Sharp Kabushiki Kaisha Error detection in a digital printer employing type wheels
US4336752A (en) * 1978-11-28 1982-06-29 Canon Kabushiki Kaisha Printing apparatus of character wheel selection, stop and simultaneously printing type
US4343238A (en) * 1980-01-16 1982-08-10 Esselte Pendaflex Corporation Counting or printing mechanism for consecutive counting numbering
US4452137A (en) * 1981-08-18 1984-06-05 Epson Corporation Small-sized printer
US4539906A (en) * 1980-02-23 1985-09-10 Sharp Kabushiki Kaisha Hand-held printer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169474A (en) * 1963-06-04 1965-02-16 Mite Corp Type cylinder
US3307676A (en) * 1965-12-30 1967-03-07 Ibm Printing apparatus with type wheel disconnected from selection means during return to home position
US3422754A (en) * 1966-03-09 1969-01-21 Zent Inst Iztchislitelna Tech Printing assembly controlled by electric pulses
US3664259A (en) * 1970-07-06 1972-05-23 Addmaster Corp Drum series printer with stop pawl engaged by a snap-over spring
US3732812A (en) * 1971-03-04 1973-05-15 Ncr Differentially positionable type wheels in remotely controlled print modules
US3738264A (en) * 1969-06-13 1973-06-12 Olympia Werke Ag Type carrier setting device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE26057E (en) * 1966-07-05 Electrically operated type wheel setting means
US2940386A (en) * 1958-01-22 1960-06-14 Royal Mcbee Corp Wheel printers
US3179044A (en) * 1961-12-20 1965-04-20 Berkel Patent Nv Electrically operated type wheel setting means
DE1867439U (de) * 1962-10-20 1963-02-21 Siemag Feinmech Werke Gmbh Druckwerk, insbesondere zeilendruckwerk.
US3176610A (en) * 1963-10-25 1965-04-06 Anelex Corp Type-setting mechanism for high speed printers
GB1184149A (en) * 1967-11-03 1970-03-11 Ibm A Printing Element
DE7019028U (de) * 1970-05-22 1971-10-07 Olympia Werke Ag Schaltwerk fuer rechenmaschinen.
DE2052302A1 (de) * 1970-10-24 1972-04-27 Sel Elektrisch steuerbares Druckwerk

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169474A (en) * 1963-06-04 1965-02-16 Mite Corp Type cylinder
US3307676A (en) * 1965-12-30 1967-03-07 Ibm Printing apparatus with type wheel disconnected from selection means during return to home position
US3422754A (en) * 1966-03-09 1969-01-21 Zent Inst Iztchislitelna Tech Printing assembly controlled by electric pulses
US3738264A (en) * 1969-06-13 1973-06-12 Olympia Werke Ag Type carrier setting device
US3664259A (en) * 1970-07-06 1972-05-23 Addmaster Corp Drum series printer with stop pawl engaged by a snap-over spring
US3732812A (en) * 1971-03-04 1973-05-15 Ncr Differentially positionable type wheels in remotely controlled print modules

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164181A (en) * 1974-05-09 1979-08-14 Kabushiki Kaisha Suwa Seikosha Printer
US4033256A (en) * 1974-05-09 1977-07-05 Kabushiki Kaisha Suwa Seikosha Printer
US4054089A (en) * 1974-12-27 1977-10-18 Copal Company Limited Line printer
US4165687A (en) * 1976-05-22 1979-08-28 Kabushiki Kaisha Suwa Seikosha Printing equipment and method of operation thereof
US4161912A (en) * 1976-06-04 1979-07-24 Shinshu Seiki Kabushiki Kaisha Miniature printer
US4152982A (en) * 1976-07-21 1979-05-08 Kabushiki Kaisha Suwa Seikosha Miniature printer
US4270448A (en) * 1977-07-06 1981-06-02 Kabushiki Kaisha Suwa Seikosha Printing device
US4262593A (en) * 1977-07-29 1981-04-21 Henry Gross Printing apparatus
US4276824A (en) * 1978-03-21 1981-07-07 Pitney Bowes Deutschland Gmbh Driving and braking system for an electronic embossing machine
US4291620A (en) * 1978-09-27 1981-09-29 Sharp Kabushiki Kaisha Error detection in a digital printer employing type wheels
US4336752A (en) * 1978-11-28 1982-06-29 Canon Kabushiki Kaisha Printing apparatus of character wheel selection, stop and simultaneously printing type
US4343238A (en) * 1980-01-16 1982-08-10 Esselte Pendaflex Corporation Counting or printing mechanism for consecutive counting numbering
US4539906A (en) * 1980-02-23 1985-09-10 Sharp Kabushiki Kaisha Hand-held printer
US4452137A (en) * 1981-08-18 1984-06-05 Epson Corporation Small-sized printer

Also Published As

Publication number Publication date
DE2331957B2 (de) 1978-04-20
GB1404292A (en) 1975-08-28
DE2331957A1 (de) 1974-01-10
DE2331957C3 (de) 1983-06-16
IT986196B (it) 1975-01-20
FR2190059A5 (de) 1974-01-25

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