US3920113A - Platen roll arrangement for typewheel printer - Google Patents

Platen roll arrangement for typewheel printer Download PDF

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Publication number
US3920113A
US3920113A US409825A US40982573A US3920113A US 3920113 A US3920113 A US 3920113A US 409825 A US409825 A US 409825A US 40982573 A US40982573 A US 40982573A US 3920113 A US3920113 A US 3920113A
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US
United States
Prior art keywords
press roller
holder
print
imprint
elastic member
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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
Application number
US409825A
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English (en)
Inventor
Kazuto Tamai
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
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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
Application filed by Suwa Seikosha KK filed Critical Suwa Seikosha KK
Application granted granted Critical
Publication of US3920113A publication Critical patent/US3920113A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J7/00Type-selecting or type-actuating mechanisms
    • B41J7/36Selecting arrangements applied to type-carriers rotating during impression
    • B41J7/46Rolling contact during impression

Definitions

  • ABSTRACT A compact printer of the type having at least one print wheel, 21 carried paper web for receiving an imprint, and, for instance, an ink ribbon for imprinting a character of the print wheel on the paper web includes a print roller for impressing the ink ribbon and paper web selectively into the print wheel.
  • the print roller comprises a press roller for pressing and rolling characters or the like circumferentially arranged on the print wheel, at a print position thereof, through the ink ribbon and paper web for forming an imprint thereon, a rotatable holder for the press roller which is rotatable on its own axis and has a recess therein for seating the press roller.
  • the press roller includes a shaft which is journaled into the holder.
  • the press roller has a radius which is longer than the difference between the journal radius of the holder and the distance between the axis of the holder and the corresponding axis of press roller.
  • This invention relates to a printing assembly for a printer and more particularly for a compact printer.
  • Ultra compact electronic table calculators are now available which employ an LSI in the electronic circuit thereof and employ an LED and liquid crystals in the display thereof.
  • highly compact, lightweight equipment which utilizes a minimum of power is in substantial demand.
  • an improved printer assembly for a compact calculator for selectively printing a character, number, symbol or the like in clear fashion on an imprint receiver, for instance, paper, including character carrying means for carrying print characters or the like on the surface thereof, a press roller for pressing and rolling characters or the like circumferentially arranged on the character carrying means at a print position thereof through an imprint receiving means, for instance, paper, and a rotatable holder for the press roller rotatable on its own axis'an'd having a recess therein for seating the press roller.
  • the number of characters circumferentially arranged on a given character carrying means will determine the number of aligned character carrying means employed in the printer for printing the selected array of characters.
  • a description of one member of the printer assembly will therefore serve as a description for all members of the composite.
  • the character carrying means is rotatably mounted on a shaft for locating a selected character in a print position until the selected character is axially aligned with the press roller, hereinafter described in greater detail.
  • imprint receiving means and print means forinst'ance, an ink ribbon.
  • Proximate the character carrying means is located the ink ribbon and proximate the press roller is located the imprint receiver, for instance, paper.
  • the press roller is carried in a holder having a camming groove for selectively unseating the press roller radially for pressing the press roller against the imprint receiver, print means, and selected character at a selected time sequence for thereby pressing an imprint on the imprint receiver through the print means.
  • FIG. 1a is a side elevational view in schematic form of a conventional printer assembly for a compact calculator
  • FIG. lb is a top plan view of the conventional printer assembly shown in FIG. 1a;
  • FIG. 2a is a side elevational view in schematic form of a printer assembly for a compact calculator constructed in accordance with this invention
  • FIG. 2b is a detail view of the press roller holder
  • FIG. 20 is an exploded perspective view of a segment of the press roller and press roller holder
  • FIG. 2a is an exploded perspective view of the retaining ring for securing the press roller movably in the press roller holder;
  • FIGS. 3a and 3b are detail views of other embodiments of press rollers and press roller holders constructed according to this invention.
  • FIG. 4 is a detail view of yet another type press roller and holder therefor;
  • FIG. 5 is a sectional view of another press roller embodiment constructed in accordance with the invention.
  • FIG. 6 is a sectional view of yet another press roller embodiment constructed in accordance with the invention.
  • FIG. 7 is a schematic view showing the relationship of parts of the various embodiments.
  • a pattern carrier 2 is rotatably mounted on a shaft 1 and characters 3 are circumferentially located on the periphery of pattern carrier 2.
  • characters 3 are circumferentially located on the periphery of pattern carrier 2.
  • pattern carrier 2 is rotated on shaft 1 for arranging a selected character 3 at a print position. in the print position, the selected character is substantially parallel with imprint means 9, for instance, an ink ribbon, and imprint receiver 8, for instance, a paper web.
  • a pressure disc 5 is rotatably mounted on a shaft 6 and supports a platen roll 4 for impressing an imprint of the character on paper web 8 through ink ribbon 9.
  • platen roll 4 is rolled and pressed against character 3 through paper web 8 and ink ribbon 9 for thereby completing a print.
  • elastically deformable member 7 of pressure disc 5 is elastically deformed, by means not shown for pressing against platen roll 4.
  • elastic deformable portion 7 has a larger spring constant as platen roll 4 is deformed toward the axis of disc 5 than when platen roll 4 is deformed in the direction of the circumference of pressure disc 5. Consequently. as platen roll 4 is applied on a selected character 3 at a print time, member 7 undergoes substantial deformation toward the circumferential edge of disc 5.
  • platen roll 4 is rolled over the selected character 3 on its own axis under the rotating influence of disc 5 rotated on shaft 6. Under the spring force of deformed member 7, platen roll 4 is moved over the print character for an imprint faster than the angular velocity of pressure disc 5. Accordingly, characters imprinted on paper web 8 may be difficult to read because the printing sequence results in dark and light print portions.
  • the radial length of pressure disc 5 is longer than the axial width of the mounting portion for the disc, and as a result thereof, pressure disc 5 inclines axially whereby there is an uneven dark and light imprint on respective sides of the selected printed character. Since the printer comprises aligned series of pattern carriers and pressure discs, this uneven printing is perpetuated through each printed column. Therefore, these conventional printers print unevenly, are bulky, difficult to maintain, and costly to operate.
  • Pattern carrier 22 is of the conventional type and is rotatably mounted on shaft 21.
  • Circumferentially arranged on the periphery of pattern carrier 22 are characters 23.
  • a number of pattern carriers may be axially arranged to coincide in number with the number of circumferentially arranged characters 23.
  • a selected character 23 to be printed is rotated to a position oppositely rotatable holder 26. Holder 26 is mounted on a shaft 27 and rotates thereon.
  • Press roller 24 Seated in holder 26 is press roller 24 for pressing and rolling paper web 28 and ink ribbon 29 into and over the selected character 23 for securing an imprint thereof on paper web 28.
  • Press roller 24 is fabricated of a suitable elastic material, for instance, rubher or plastic, and is rotatably mounted on a shaft which is freely seated in recesses 31 of holder 26. As best seen in FIG. 2b, press roller 24 is freely rotatable in recess of holder 26.
  • Press roller 24 is supported on shaft 25 in such way that the radius of press roller 24 is longer than the difference between the journal radius of holder 26 and the distance between the rotational center of holder 26 and the axis of press roller 24.
  • the journal radius of holder 4 26 is the radius of shaft 27. Accordingly, load torque at printing time is commensurately reduced and the printer is more compact and lighter in weight than those of the conventional type.
  • press roller 24 When holder 26 is rotated from a rest position around journal 27, press roller 24 is simultaneously rotated around journal 27. As press roller 24 is pressed and rolled over a selected character 23, arranged in a printing position on pattern carrier 22, an imprint thereof is received on paper web 28 through ink ribbon 29. After the printing operation is completed, press roller 24 and holder 26 are brought to a rest position and the printing cycle is complete.
  • holder 26 is provided with peripheral recesses for seating therein and supporting press roller shaft 25.
  • annular retaining ring 33 fabricated of resilient material is elastically seated in each circumferential groove 32 provided in the periphery of holder 26.
  • the expression for energy required to roll press roller 24 from point C to point C over the surface of selected character 23 may be derived as follows:
  • Eh deforming energy for the press roller as it rolls over the surface of the selected character.
  • boss in rotary shaft R of the holder is omitted as insignificant.
  • the above equation may be balanced to express torque as follows:
  • the size and weight of the printer may be reduced, because I is reduced for reducing l R for reducing load torque. Since the printer operates under a reduced load torque at printing time, the motor and power transmitting system therefor may also be compacted for lightness and lower power consumption. Since the improved printer does not employ a pressure disc of the type used in conventional printers, the rolling speed of the press roller may be fixed during printing and since the press roller is not inclined, an even print is obtained.
  • the press roller may be modified in various ways for use in connection with the holder.
  • tubular pressing member 43 suitably fabricated of rubber, plastic, metal and the like, surrounds elastic member 42, suitably fabricated of rubber, plastic and the like.
  • elastic member 42 suitably fabricated of rubber, plastic and the like.
  • press roller shaft 41 Axially mounted in elastic member 42 is press roller shaft 41.
  • pressing member 43 is more resilient than elastic member 42.
  • pressing member 43 may be continuous or ridged.
  • FIG. 4 which illustrates a preferred press roller
  • the tubular pressing member 53 is sandwiched between a tubular elastic member'54 and an elastic member 52 which is rotatably mounted on shaft 51.
  • Elastic members 52 and 54, as well as'pressing member 53 may be fabricated of rubber, plastic and the like.
  • pressing member 53 is harder than elastic members 52 and 54.
  • elastic member 54 rolls over the character contour for a highly satisfactory imprint.
  • the character pressing portion 63 surrounds a discretely slotted elastic deformable portion rotatably mounted on press roller shaft 61.
  • pressing member 73 suitably fabricated of rubber or plastic overlies elastic member 72, also suitably fabricated of rubber or plastic, which is rotatably mounted on shaft 71.
  • Pressing member 73 is preferably harder than elastic member 72.
  • Elastic member 72 is provided with ridges 74 in the periphery thereof corresponding to the distance between each discrete pressing member 73. During the printing operation, only certain of the elastic members 72 undergo deformation while other of the members 72 do not due to ridges 74 and an even imprint is obtained.
  • a print means comprising a press roller for pressing and rolling characters or the like circumferentially arranged on said pattern carrier at a print position thereof against said imprint receiver, a rotatable holder for said press roller rotatable on its own axis and having a recess therein for seating said press roller, a shaft for said press roller, a pair of opposed recesses in the periphery of said holder in which opposed ends of said shaft are journaled, said press roller being freely accommodated in said recess therefor provided in said holder, said press roller having a radius which is longer than the difference between the journal radius of said holder and the distance between the axis of said holder and the axis of said press roller.
  • the print means of claim 1 including a pair of annular rings for retaining opposed ends of said press roller shaft in said opposed recesses of said holder, and a pair of circumferentially arranged grooves in the periphery of said holder for seating said annular rings.
  • the print means of claim 3 including a tubular elastic member overlying said pressing member.
  • said press roller comprises a circumferentially ridged elastic cylindrical member, a rotary shaft axially mounted through said ridged elastic member and discrete annular pressing members overlying annular ridges of said elastic member.

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US409825A 1972-10-26 1973-10-26 Platen roll arrangement for typewheel printer Expired - Lifetime US3920113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47107335A JPS4967722A (pt) 1972-10-26 1972-10-26

Publications (1)

Publication Number Publication Date
US3920113A true US3920113A (en) 1975-11-18

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ID=14456430

Family Applications (1)

Application Number Title Priority Date Filing Date
US409825A Expired - Lifetime US3920113A (en) 1972-10-26 1973-10-26 Platen roll arrangement for typewheel printer

Country Status (8)

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US (1) US3920113A (pt)
JP (1) JPS4967722A (pt)
DE (1) DE2353822A1 (pt)
FR (1) FR2205001A5 (pt)
GB (1) GB1423619A (pt)
HK (1) HK5278A (pt)
IT (1) IT994438B (pt)
MY (1) MY7800098A (pt)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110152A (en) * 1975-06-20 1978-08-29 Avery International Corporation Embossing roller and method
US4303013A (en) * 1978-02-16 1981-12-01 Kabushiki Kaisha Suwa Seikosha Micro-printer with unitary plastic frame
FR2488187A1 (fr) * 1980-08-08 1982-02-12 Shinshu Seiki Kk Imprimante de petite taille
US4369704A (en) * 1979-12-13 1983-01-25 Kienzle Apparate Gmbh Printing device for distance counter mechanism
US4401027A (en) * 1980-06-12 1983-08-30 Canon Kabushiki Kaisha Printing mechanism
US4411197A (en) * 1979-08-14 1983-10-25 Kabushiki Kaisha Sato Kenkyusho Printing device for hand labeler
US4746234A (en) * 1983-07-23 1988-05-24 Francotyp-Postalia Gmbh Relating to postal franking machines
US4760785A (en) * 1985-12-25 1988-08-02 Alps Electric Co., Ltd. Printer with rotating hammers
US4855756A (en) * 1987-12-28 1989-08-08 Pitney Bowes, Inc. Thermal transfer printing apparatus including means for controlling printing on irregularly-shaped letters
US4857942A (en) * 1987-12-28 1989-08-15 Pitney Bowes Inc. Apparatus for processing irregularly-shaped letters in a thermal printer
US4929106A (en) * 1988-10-12 1990-05-29 Pitney Bowes Inc. Platen module
US7121990B2 (en) 1999-04-22 2006-10-17 Heron Sondermaschinen Und Steuerungen Gmbh Elastomeric running wheel for platens or the like

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS566958Y2 (pt) * 1974-12-19 1981-02-16
JPS5185817A (ja) * 1975-01-25 1976-07-27 Ricoh Kk Injisochi
JPS51147508U (pt) * 1975-05-20 1976-11-26
JPS526219A (en) * 1975-07-02 1977-01-18 Ricoh Kk Printer
JPS5285508U (pt) * 1975-12-22 1977-06-25
JPS5290110U (pt) * 1975-12-27 1977-07-05

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1524661A (en) * 1922-10-27 1925-02-03 Underwood Typewriter Co Typewriting machine
US2049452A (en) * 1932-11-14 1936-08-04 Kelly Process Inc Roller or flat platen
US3381790A (en) * 1966-05-13 1968-05-07 Sarl Soc Lamy D Etudes Et De R Rolling contact typewheel printer
US3480127A (en) * 1966-06-16 1969-11-25 Olympia Werke Ag Printing platen for calculating and bookkeeping machines
US3717234A (en) * 1969-10-14 1973-02-20 Siemens Ag Carrier for type carriers for high speed printing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1524661A (en) * 1922-10-27 1925-02-03 Underwood Typewriter Co Typewriting machine
US2049452A (en) * 1932-11-14 1936-08-04 Kelly Process Inc Roller or flat platen
US3381790A (en) * 1966-05-13 1968-05-07 Sarl Soc Lamy D Etudes Et De R Rolling contact typewheel printer
US3480127A (en) * 1966-06-16 1969-11-25 Olympia Werke Ag Printing platen for calculating and bookkeeping machines
US3717234A (en) * 1969-10-14 1973-02-20 Siemens Ag Carrier for type carriers for high speed printing device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110152A (en) * 1975-06-20 1978-08-29 Avery International Corporation Embossing roller and method
US4303013A (en) * 1978-02-16 1981-12-01 Kabushiki Kaisha Suwa Seikosha Micro-printer with unitary plastic frame
US4411197A (en) * 1979-08-14 1983-10-25 Kabushiki Kaisha Sato Kenkyusho Printing device for hand labeler
US4369704A (en) * 1979-12-13 1983-01-25 Kienzle Apparate Gmbh Printing device for distance counter mechanism
US4401027A (en) * 1980-06-12 1983-08-30 Canon Kabushiki Kaisha Printing mechanism
US4398461A (en) * 1980-08-08 1983-08-16 Shinshu Seiki Kabushiki Kaisha Small printer
FR2488187A1 (fr) * 1980-08-08 1982-02-12 Shinshu Seiki Kk Imprimante de petite taille
DE3153173C2 (de) * 1980-08-08 1986-09-18 Epson Corp. Druckwalzenmechanismus für ein Druckwerk
US4746234A (en) * 1983-07-23 1988-05-24 Francotyp-Postalia Gmbh Relating to postal franking machines
US4760785A (en) * 1985-12-25 1988-08-02 Alps Electric Co., Ltd. Printer with rotating hammers
US4855756A (en) * 1987-12-28 1989-08-08 Pitney Bowes, Inc. Thermal transfer printing apparatus including means for controlling printing on irregularly-shaped letters
US4857942A (en) * 1987-12-28 1989-08-15 Pitney Bowes Inc. Apparatus for processing irregularly-shaped letters in a thermal printer
US4929106A (en) * 1988-10-12 1990-05-29 Pitney Bowes Inc. Platen module
US7121990B2 (en) 1999-04-22 2006-10-17 Heron Sondermaschinen Und Steuerungen Gmbh Elastomeric running wheel for platens or the like

Also Published As

Publication number Publication date
IT994438B (it) 1975-10-20
HK5278A (en) 1978-01-27
MY7800098A (en) 1978-12-31
FR2205001A5 (pt) 1974-05-24
DE2353822A1 (de) 1974-05-09
JPS4967722A (pt) 1974-07-01
GB1423619A (en) 1976-02-04

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