US3848722A - Print disc assembly for a printer - Google Patents

Print disc assembly for a printer Download PDF

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Publication number
US3848722A
US3848722A US00362563A US36256373A US3848722A US 3848722 A US3848722 A US 3848722A US 00362563 A US00362563 A US 00362563A US 36256373 A US36256373 A US 36256373A US 3848722 A US3848722 A US 3848722A
Authority
US
United States
Prior art keywords
interposer
type
disc
print
spokes
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
US00362563A
Other languages
English (en)
Inventor
L Weber
J Drejza
C Holovka
P Bolan
A Bryant
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to US00362563A priority Critical patent/US3848722A/en
Priority to IT20307/74A priority patent/IT1006310B/it
Priority to DE2415626A priority patent/DE2415626C3/de
Priority to JP49037064A priority patent/JPS5228408B2/ja
Priority to FR7413426A priority patent/FR2230502B1/fr
Priority to GB1782174A priority patent/GB1419737A/en
Priority to US05/509,194 priority patent/US3970186A/en
Application granted granted Critical
Publication of US3848722A publication Critical patent/US3848722A/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
    • 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
    • B41J1/24—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 perpendicular to the axis of rotation
    • B41J1/28—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers
    • B41J1/30—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers with the types or dies moving relative to the carriers or mounted on flexible carriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S400/00—Typewriting machines
    • Y10S400/901—Continuously rotating type-head

Definitions

  • a print disc assembly comprises a central support wheel having a plurality of axial openings adjacent to periphery.
  • a spoked type disc is secured to one side of the wheel and a spoked interposer to the other side.
  • Slideable slugs in the axial openings transmit impact energy from the interposer to the type disc for printing.
  • printers such as disclosed in (IBM Docket EN972010) patent application Ser. No. 259,320 filed 06/2/72 of Johann H. Meier, et al, entitled Type Disc interposer Assembly for a Printer.
  • Another object of the invention is to provide for combining a low inertia type element wth additional operating mass so as to obtain improved print quality.
  • Yet another object of the invention is to provide a light weight type element with a separate operating mass for improving the operating characteristics thereof.
  • Another important object of the invention is to provide a light weight type element with a separate operating mass of many times the mass of the type element.
  • Still another important object of the invention is to provide in a print disc assembly for preloading a resilient type disc and a spoked interposer with a slideable operating mass therebetween.
  • Yet another important object of the invention is to provide for interposing a resilient damper ring between a spoked interposer and a plurality of slideable operating slugs used to impact the type against the document.
  • FIG. 1 is a schematic isometric view in part of a printer mechanism embodying the invention in one of its forms.
  • FIG. 2 is an enlarged cross-sectional view along the line 2-2 of FIG. 1.
  • FIG. 2a is a partial front elevational view of the type disc and securing means.
  • FIG. 3 is a partial view in the side elevation of a portion of a print disc and type element of the prior art.
  • FIG. 4 is a partial view in the side elevation of a portion of a type disc assembly embodying the present invention with the center line of the slug coinciding with the center line of the type character.
  • FIG. 5 is a partial view in the side elevation of a portion of a print disc assembly embodying the present invention with the center line of the slug above the middle and is at the effective center line of the type character
  • FIG. 6 is a partial view in the side elevation of a portion of a print disc assembly embodying the present invention wherein the center line of the slideable slug is below the middle and is at the effective center line of the type character on the type disc.
  • a rotatable print disc assembly 10 is positioned to move past a document 12 which is backed up by a platen 14, in conjunction with a print hammer 16 operated by a solenoid 18 to impact the print disc against the document for printing.
  • Contact paper may be used, a type ribbon may be used or the type may be inked by any suitable means for producing an image on the document.
  • the print disc assembly 10 comprises a print disc 20 having radial slots 21 defining a plurality of radial spokes or fingers 22 having type characters 23 thereon for impacting the document 12.
  • the type characters 23 may be an integral part of the fingers 22 being for example formed by etching away the material of the fingers to leave raised type characters.
  • the type disc assembly 10 comprises a central hub portion 24 having a recess 26 disposed to fit on a shoulder 28 on the end of a rotatable shaft 30.
  • An emitter disc 32 is mounted on the shoulder portion 28 of the shaft 30 comprising a plastic disc 33 having a metal ring insert 34 provided with teeth 35 above the periphery for cooperation with a transducer (not shown) for determining the relative position of the print disc.
  • the disc 33 is provided with a recess 36 and aprojecting circular rib 38 having an inclined surface portion 40 for a purpose to be explained hereinafter.
  • the hub 24 is secured to the shaft 30 by means of a knurled screw 42 having a threaded portion 43 threadably engaged in an opening in the shaft 30.
  • the hub 24 forms a mount for a support wheel portion 46 which is provided with a plurality of axial openings about the edge of the wheel for receiving separate type operating slugs 48 which are slideably disposed in the openings 49 to engage and actuate an associated type finger 22, one such opening being associated with each type character bearing finger 22.
  • the print disc 20 is secured to the hub 24 by means of a mumber of rivets 40 which project through the hub and are provided with grooved end portions 52 disposed to be positioned in buttonholeshaped openings 54 of the print disc for detachably securing the disc to the support wheel. Details of the mounting are shown in FIG. 2a.
  • the hub 24 is provided with a shoulder portion 56 for receiving an interposer disc '58 which is slotted regularly to provide a plurality of spokes or fingers 60 associated one with each of the type operating slugs 48.
  • the support wheel 46 is provided with a circular rib 62 positioned just inside the row of holes 49. This rib 62 provides a stop or fulcrum for the interposer fingers 60 and support for a detuning ring 64 comprising a polyurethane material having a nylon fabric backing which is positioned between the interposer finger 60 and the type operating slug 48 to control the action of the hammer interposer slug and type finger system, to prevent the type finger from arriving at the platen before the slug arrives.
  • the ring 64 is wider than the opening of the hole 49 so that it engages the rear surface of the support wheel 46 when the interposer 60 is struck by the print hammer 16 to impact and impel an associated slug 48 during printing.
  • the rear surface of the interposer 60 is bevelled so as to provide a restoring force for the print hammer 16 as the print wheel assembly rotates.
  • the rivet 50 functions to loosely couple the print disc 20 with a support wheel 46 while at the same time clamping the interposer 58 to the support wheel 46 through the medium of a clamp ring 68.
  • the hub 24 of the support wheel 46 is forced toward the emitter disc 33 and the inclined surface 40 of the emitter disc engages the disc 20 deforming it as shown so as to pretension the type finger 22 against the type operating slug 48 and the interposer finger 60.
  • an interposer finger 60 is struck by the print hammer 16, it bends about the rib 62 and impacts the slug 48 which drives the corresponding type disc finger 22 to impact its type character 23 against the document for printing.
  • the reference numerals 22a and 23a denote a previous construction of type finger and type character bearing slug. Because the prior design had a relatively high mass type slug 23a mounted on the type finger 22d, partial printing of the character often resulted. In the case shown only the bottom of the character will print because the high inertia of the type slug prevents the type slug from rotating into position to print a full character before the complete unit bounces off the platen. With the construction in FIG. 4 the force of the slug 48 is always applied behind the center of gravity of the type 23 resulting in a good type-platen alignment (full character printing) during printing.
  • the slug mass system will correct for any misalignment of the type face, not just bottom misalignment.
  • the slug design can be varied to correct for severe variations in type character geometry.
  • the curved ends of the type actuating slug 48a are proportioned to raise the effective center line of the slug so that it is substantially in alignment with the principal portion of the type character 23b on a finger 22b.
  • the contour of the ends of the type actuating slug 48b are varied to place the effective mass of the type actuating slug below the'normal center line so that it is substantially in alignment with the principal mass of the type character 23c on a finger 22c.
  • the type character on the print disc has a relatively low mass.
  • the mass of the movable type operating slug may be 0.18 grams as compared with a mass for the type character on the type finger of 0.03 grams.
  • the type fingers are 0.875 inches long and 0.08 inches wide, while the interposer fingers are 0.875 inches long and 0.080 inches wide.
  • the stiffness of the interposer is much greater than the stiffness of the fingers on the type disc the interposer being for example 0.030 inches thick whereas the finger of the print disc is 0.0 l 0 inches thick making the interposer finger on the order of 27 times as stiff.
  • the print disc is 3.448 inches in diameter; the interposer is 3.47 inches in diameter, and the rib 62 on the support wheel is 2.9 inches inside diameter and 3.02 inches outside diameter. This places the rib approximately 0.25 inches from the end of the interposer finger which is 0.875 inches long.
  • the print disc when assembled is deformed so as to provide a prestressing of thetype fingers on the order of 20 to 40 grams force.
  • Both the interposer 58 and the type disc 20 are provided with damping rings 19-25 and 27-29, respectively consisting of a neoprene material backed with a dacron fabric.
  • a metal ring 31 may be secured to the outer surface of the damping ring 19 on the type disc to reinforce the type bearing fingers.
  • the separate slug and type construction permits a curved contact surface on the slug to provide the contact between the slug and type, permitting the use of a sufficient mass for good print quality while having a sort of universal joint connection between the slug and type, adjacent the center of mass of the type which permits the relatively light mass type to align independently of the slug during printing, for the best print quality.
  • an improvied print wheel assembly which utilizes a low mass type character and an independent slug which provides not only the energy for printing by driving the type against the platen, but also permits relative adjustment of the type and slug to align the type for printing.
  • the slug is driven through the action of a print hammer and an interposer with a visco-elastic ring being positioned between the interposer and the drive type slug to detune the action of the hammer, interposer slug,
  • fingers are designed to allow deflection both towards the platen and in a plane perpendicular to the plane of the paper without exceeding the structural limits of the material.
  • the force of the slug is always applied behind the center of gravity of the type, resulting in good type-platen alignment during printing.
  • a resilient spoked print disc mounted on one side of and secured to said support wheel having integral type characters adjacent the ends of said spokes;
  • a resilient spoked interposer secured to and rotatable with said support wheel on the other side with the spokes of said interposer normally biasing said slugs against the corresponding spokes of said print disc.

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US00362563A 1973-05-21 1973-05-21 Print disc assembly for a printer Expired - Lifetime US3848722A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00362563A US3848722A (en) 1973-05-21 1973-05-21 Print disc assembly for a printer
IT20307/74A IT1006310B (it) 1973-05-21 1974-02-08 Stampatrice di dati ad alta velocita
DE2415626A DE2415626C3 (de) 1973-05-21 1974-03-30 Typenscheibenanordnung für einen Typendrucker
JP49037064A JPS5228408B2 (enrdf_load_stackoverflow) 1973-05-21 1974-04-03
FR7413426A FR2230502B1 (enrdf_load_stackoverflow) 1973-05-21 1974-04-10
GB1782174A GB1419737A (en) 1973-05-21 1974-04-24 Print disc assemlby
US05/509,194 US3970186A (en) 1973-05-21 1974-09-25 Damper for a composite print wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00362563A US3848722A (en) 1973-05-21 1973-05-21 Print disc assembly for a printer

Publications (1)

Publication Number Publication Date
US3848722A true US3848722A (en) 1974-11-19

Family

ID=23426591

Family Applications (1)

Application Number Title Priority Date Filing Date
US00362563A Expired - Lifetime US3848722A (en) 1973-05-21 1973-05-21 Print disc assembly for a printer

Country Status (5)

Country Link
US (1) US3848722A (enrdf_load_stackoverflow)
JP (1) JPS5228408B2 (enrdf_load_stackoverflow)
DE (1) DE2415626C3 (enrdf_load_stackoverflow)
GB (1) GB1419737A (enrdf_load_stackoverflow)
IT (1) IT1006310B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949853A (en) * 1974-09-25 1976-04-13 Xerox Corporation Proportional-spaced character print wheel
US3970186A (en) * 1973-05-21 1976-07-20 Xerox Corporation Damper for a composite print wheel
US4018639A (en) * 1975-10-15 1977-04-19 Xerox Corporation Method of assembling a composite print wheel
US4037706A (en) * 1974-09-25 1977-07-26 Xerox Corporation Composite print wheel
US4093059A (en) * 1976-12-06 1978-06-06 Xerox Corporation Character slug construction
US4124930A (en) * 1976-10-19 1978-11-14 Caracteres S.A. Method for manufacturing a characters carrying aggregate for printing machine
US4202639A (en) * 1977-09-14 1980-05-13 Exxon Research & Engineering Co. Daisy loading apparatus
US4411539A (en) * 1980-12-18 1983-10-25 Ricoh Company, Ltd. Print element with plural type layers of varying thickness
WO1985003034A1 (en) * 1984-01-16 1985-07-18 Roy Jeremy Lahr Rotary print element, components thereof and drive coupling apparatus therefor
EP0160809A3 (en) * 1984-05-05 1986-06-04 Olympia Werke Ag Type carrier disc
US4674898A (en) * 1984-11-05 1987-06-23 The Fern Group, Inc. Printwheel
US5245921A (en) * 1992-07-16 1993-09-21 International Business Machines Corporation Interposer device for impact printers

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5929438B2 (ja) * 1976-09-29 1984-07-20 株式会社リコー 印字装置
GB2024108B (en) 1978-01-24 1982-06-30 Ricoh Kk Print wheel mounting assembly for a serial printer
NL7812469A (nl) * 1978-05-01 1979-11-05 Hutchinson Ind Corp Geeetste drukletter en werkwijze voor de vervaardiging daarvan.
DE2822313C2 (de) * 1978-05-22 1985-07-04 Olympia Werke Ag, 2940 Wilhelmshaven Typenradkassette für Schreib- oder ähnliche Büromaschinen
DE3424045A1 (de) * 1983-06-30 1985-01-03 Alps Electric Co., Ltd., Tokio/Tokyo Typenraddrucker

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149562A (en) * 1960-12-02 1964-09-22 Honeywell Regulator Co Pneumatically operable slug module in high speed printers
US3282389A (en) * 1964-08-13 1966-11-01 Pannier Corp Rotary imprinting machine moving selected character to imprinting position by shortest arc
US3295652A (en) * 1964-03-25 1967-01-03 Oki Electric Ind Co Ltd Type drum selector using sliding plates
US3371766A (en) * 1966-07-18 1968-03-05 Internat Telephone & Telegraph Printing apparatus
US3585927A (en) * 1969-12-22 1971-06-22 Ibm Pivotally mounted high performance print magnet
US3651915A (en) * 1968-11-07 1972-03-28 Olympia Werke Ag Printing mechanism for electrically operated office machines
US3675172A (en) * 1971-05-17 1972-07-04 Decision Data Corp Damping apparatus for a linear actuator device
US3698529A (en) * 1970-07-14 1972-10-17 Honeywell Inf Systems Serial printer with fixed interposer
US3715978A (en) * 1970-09-03 1973-02-13 Ibm Printer hammer mechanism
US3759174A (en) * 1970-06-04 1973-09-18 Philips Corp Print hammer striking moving type at an angle to compensate for frictional force

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2186891A5 (enrdf_load_stackoverflow) * 1972-06-02 1974-01-11 Ibm

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149562A (en) * 1960-12-02 1964-09-22 Honeywell Regulator Co Pneumatically operable slug module in high speed printers
US3295652A (en) * 1964-03-25 1967-01-03 Oki Electric Ind Co Ltd Type drum selector using sliding plates
US3282389A (en) * 1964-08-13 1966-11-01 Pannier Corp Rotary imprinting machine moving selected character to imprinting position by shortest arc
US3371766A (en) * 1966-07-18 1968-03-05 Internat Telephone & Telegraph Printing apparatus
US3651915A (en) * 1968-11-07 1972-03-28 Olympia Werke Ag Printing mechanism for electrically operated office machines
US3585927A (en) * 1969-12-22 1971-06-22 Ibm Pivotally mounted high performance print magnet
US3759174A (en) * 1970-06-04 1973-09-18 Philips Corp Print hammer striking moving type at an angle to compensate for frictional force
US3698529A (en) * 1970-07-14 1972-10-17 Honeywell Inf Systems Serial printer with fixed interposer
US3715978A (en) * 1970-09-03 1973-02-13 Ibm Printer hammer mechanism
US3675172A (en) * 1971-05-17 1972-07-04 Decision Data Corp Damping apparatus for a linear actuator device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970186A (en) * 1973-05-21 1976-07-20 Xerox Corporation Damper for a composite print wheel
US3949853A (en) * 1974-09-25 1976-04-13 Xerox Corporation Proportional-spaced character print wheel
US4037706A (en) * 1974-09-25 1977-07-26 Xerox Corporation Composite print wheel
US4018639A (en) * 1975-10-15 1977-04-19 Xerox Corporation Method of assembling a composite print wheel
US4124930A (en) * 1976-10-19 1978-11-14 Caracteres S.A. Method for manufacturing a characters carrying aggregate for printing machine
US4093059A (en) * 1976-12-06 1978-06-06 Xerox Corporation Character slug construction
US4202639A (en) * 1977-09-14 1980-05-13 Exxon Research & Engineering Co. Daisy loading apparatus
US4411539A (en) * 1980-12-18 1983-10-25 Ricoh Company, Ltd. Print element with plural type layers of varying thickness
WO1985003034A1 (en) * 1984-01-16 1985-07-18 Roy Jeremy Lahr Rotary print element, components thereof and drive coupling apparatus therefor
EP0160809A3 (en) * 1984-05-05 1986-06-04 Olympia Werke Ag Type carrier disc
US4668113A (en) * 1984-05-05 1987-05-26 Olympia Werke Ag Printing disc with damping means
US4674898A (en) * 1984-11-05 1987-06-23 The Fern Group, Inc. Printwheel
US5245921A (en) * 1992-07-16 1993-09-21 International Business Machines Corporation Interposer device for impact printers

Also Published As

Publication number Publication date
JPS5228408B2 (enrdf_load_stackoverflow) 1977-07-26
DE2415626A1 (de) 1974-12-12
GB1419737A (en) 1975-12-31
IT1006310B (it) 1976-09-30
DE2415626C3 (de) 1982-02-25
JPS5011623A (enrdf_load_stackoverflow) 1975-02-06
DE2415626B2 (de) 1981-06-19

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