US3604347A - Print hammer impact tip - Google Patents

Print hammer impact tip Download PDF

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Publication number
US3604347A
US3604347A US798312A US3604347DA US3604347A US 3604347 A US3604347 A US 3604347A US 798312 A US798312 A US 798312A US 3604347D A US3604347D A US 3604347DA US 3604347 A US3604347 A US 3604347A
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US
United States
Prior art keywords
tip
character
typedrum
column
characters
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
US798312A
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English (en)
Inventor
Ronald E Muterspaw
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.)
NCR Voyix Corp
National Cash Register Co
Original Assignee
NCR 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 NCR Corp filed Critical NCR Corp
Application granted granted Critical
Publication of US3604347A publication Critical patent/US3604347A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J9/133—Construction of hammer body or tip
    • 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
    • B41J9/10—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position
    • B41J9/12—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position each operating in more than one character position

Definitions

  • Muckenthaler ABSTRACT A centrally supported print hammer having an impact tip adaptable for striking type characters in more than one column on a rotating typedrum, the tip providing a concave surface curvature for engaging with one edge or a portion of a character prior to engaging with another edge or the remaining portion of the same character.
  • the tip is formed with the surface curvature in a direction axially along the drum; that is, the surface is concave in a direction normal to the curvature of the drum, whereupon, at the moment of impact, the uneven force resulting from the tips striking a character offset from the centralized driving force is compensated by the tip curvature to provide uniform print density oounb mum- PATENTED SEPI 41%
  • FIG.3 A centrally supported print hammer having an impact tip adaptable for striking type characters in more than one column on a rotating typedrum, the tip providing a concave surface curvature for engaging with one edge or a portion of a character prior to engaging with another edge or the remaining portion of the same character
  • the wide-faced hammer is centrally supported and driven, the raised surface of the character will be struck by a force slightly off center from the driving force, and the hammer will thus tend to pivot into the blank space.
  • the characters extend only slightly above the plane of the drum, it is sufficient to create a couple which is measurable in the range of forces and speeds commonly used in present-day printers.
  • the resulting printout of a character of the type having two vertical edges will have a distinct variation in density across the face of the printed character. Therefore, it is desirable to provide means on the hammer to compensate for the uneven forces thrust upon the face of the character at the time of impact.
  • the present invention relates to a high-speed printer and more particularly to a printer having a continuously rotating typedrum and a plurality of hammers along a typeline adaptable for striking the type characters in more than one column on the drum.
  • the typedrum is divided into two segments or sectors wherein each column contains characters around one segment or one half of the drum, and the other segment is blank in this column, so that, across the drum, every other column in each segment includes raised characters; that is, with blank columns and columns of type alternating across the drum.
  • the odd-numbered columns of type are in one sector, and the even-numbered columns are in the other.
  • each hammer being constructed to span two columns, one characterized and one blank
  • the support and driving force for the hammer is positioned centrally, with the result that, when the hammer is driven against the drum, one side or end portion of the impact tip strikes a character, and the other, or opposite, such portion strikes a blank.
  • the face or impact tip of each hammer is wide enough so that it will print in either of two columns, as determined by the sectors of the typedrum, during the respective time periods a character is presented at the typeline.
  • the hammer is in a free flight condition, so that rigid.
  • the present invention provides an impact tip for a print hammer which is sufficiently wide to span two columns of characters, the tip having a frontal surface curvature wherein the tip area farthest from the central driving force or support strikes the outer portion of the character slightly prior to the striking of its inner portion, nearer the support. In this manner, the farthest portion of the character is struck first, with a slightly greater force, and the tendency to pivot about the edge nearer the center of the hammer completes the impact, so that a more uniform print density is accomplished.
  • the hammer strikes one character at a time either with the right side of the impact surface or with the left side of the surface relative to the hammer central driving force. If the right side strikes a character, the left side strikes against a blank space, and vice versa.
  • the principal object of the present invention is to provide an improved print hammer impact tip to insure uniform printing.
  • Another object of the present invention is to provide a more uniform print with a print hammer which is capable of spanning two columns.
  • a further object of the present invention is to provide an impact tip for a print hammer spanning two character columns wherein one portion of the tip strikes a character portion prior to the striking of an adjacent and remaining portion of the character.
  • An additional object of the present invention is to provide a print hammer impact tip having a curvature on one face thereof for producing a more uniform print density.
  • Another object of the present invention is to provide a print hammer impact tip having a face curvature to compensate for uneven forces across the tip at the moment of impact.
  • FIG. 1 is a view of a typedrum showing a representative arrangement of type characters thereon, and the lineup of print hammers;
  • FIG. 2 is a development of a portion of the typedrum of FIG. 1 and also shows the configuration of the print hammer tips;
  • FIG 3 is a fragmentary side view showing a portion of a print hammer assembly positioned in relation to the typedrum;
  • FIG. 4 is a view taken on the line 4-4 of FIG. 3;
  • FIG. 5 is a top view of the assembly shown in FIG. 3;
  • FIG. 6 is an enlarged view of the hammer tip portion taken on the line 6-6 of FIG. 4;
  • FIG. 7 is a top view of the hammer tip shown in FIG. 6, and also shows the relationship of associated parts in greater detail.
  • a cylindrical typedrum 10 whose peripheral surface carries a plurality of side-by-side type columns 11,12 and is divided into two semicircular sectors or segments 14 and 16.
  • Each type column of the drum 10 includes a portion which has type characters thereon and a portion which is blank.
  • the odd-numbered columns of type 11 are in one sector 14, and the even-numbered columns 12 are in the other sector 16.
  • the blank columns and the columns of type alternate across the drum, so that a column of type in one sector lines up with a blank column in the other sector.
  • the typedrum is a part of the printing mechanism, which also includes the print hammers and solenoids which drive the hammers towards the typedrum under suitable selective controls.
  • an ink ribbon travels in a path past the drum, and paper is placed between the hammer and the ribbon, so that, when a solenoid is fired, it drives the hammer, which, inturn, drives the paper against the ribbon and the typeface, leaving an impression, or imprint, on the paper.
  • the solenoid drive and control is determined by the appropriate circuitry for high-speed printers with which the present invention may be used.
  • the type drum 10 is continuously rotated on a shaft 18 journaled in a typeline assembly frame and driven by a suitable drive motor (not shown).
  • Type faces or characters 20 are etched on the surface of the drum by well-known means, the numerals l to 4 and the letters A to D being representative, as shown in FIGS. 1 and 2.
  • the numerals, the letters, and other type characters are generally not in sequential fashion; however, for the purposes of this application, it is significant that blank columns separate the character columns across the drum, as shown.
  • the surface of a standard such type drum may carry one hundred and thirty-five columns of type, with sixty-four characters in each column, and wherein all the characters would be etched in alternate columns in one sector 14 or 16 and all the characters etched in the adjacent columns of the other such sector. It is understood that each character column contains the 64 alpha-numeric characters, so, in this respect, a print hammer spanning the two columns 11 and 12 is capable of imprinting all of the characters in one halfrevolution of the drum 10.
  • a plurality of print hammers 22, each including a central support 24, are positioned along the usual typeline for impact with the characters an the drum 10.
  • Several of the hammers 22 may be attachably grouped on a hanger 25, with the individual hammers themselves each carried by an interconnected hammer spring 26.
  • each hammer 22, when fired by its solenoid (not shown), is driven towards the drum 10 and carries the paper 27 and the ribbon 28 with it to contact a type character 20.
  • the hammer When so driven towards the drum 10, the hammer is actually in a state of free flight by reason of its spring-26-carried central support 24, the driving force being generally centralized along said support.
  • FIG. 2, 5, and 7 show the configuration of the impact tip 30 making up the present invention where the face of the tip has a curvature which is concave in relation to the end of the hammer 22.
  • Each hammer tip 30 has a dimension in one direction (FIG. 3) slightly greater than the height of a character 20, and a dimension in the other direction sufficiently wide to span two adjacent character columns 11 and 12 (FIGS. 1 and 2).
  • the face of the impact tip 30 is curved in a direction laterally along the drum 10 and extending towards the ends thereof to compensate for the tendency of the hammer to pivot it into the blank columnar space. As seen in FIG.
  • the hammer 22 may be so positioned in relation to a column of characters that the left portion of its impact tip strikes a character in one sector 14 of the drum upon rotation of the drum, while the right portion of the tip strikes a character in the other sector 16 of the drum, it being noted that the portion of the tip not being used for impact with a character at any one instant will extend into a blank column space.
  • an impact tip 30 of the present invention would have an outer and an inner curved impact portion on each side of its centerline.
  • the resulting curved face 32 would be divided into a left, outer portion 34 (FIG. 2), a left, inner portion 36, a right, inner portion 38, and a right, outer portion 40.
  • These portions are seen enlarged in FIG. 7 in relation to representative characters 20.
  • the portion 34 of the face 32 will strike the left edge of the character slightly prior to the portion 36 striking its right edge.
  • the portion 40 will strike the right edge of the character in the even-numbered column 12 slightly prior to the portion 38 striking its left edge.
  • a typedrum having a plurality of columns of type characters on the periphery thereof, each column having a portion with type characters thereon and a portion which is blank, with the blank portions of each of the columns being positioned adjacent the type portions of the respective columns contiguous thereto, and a print hammer centrally supported and capable of spanning the space of two of the columns upon engagement with the typedrum and including an impact tip having a curvature for engaging with a portion of one character in one column prior to engaging with another portion of the same character upon impact of the hammer so that the density of an imprint therefrom is substantially uniform across the face of the printed character.
  • tip curvature extends across the space of a character portion of a column and a blank portion of an adjacent column in a direction along the typedrum.
  • curvature extends across the space of a character portion of a column and a blank portion of an adjacent column and assumes a shape in which normals to the curve converge on a plane along the typedrum.
  • a printer having means for providing uniform density of printed characters.
  • a rotary typedrum with columns of characters thereon. each column having a portion with type characters and a portion which is blank, with the blank portions of each of the columns being positioned adjacent the type portions of the respective columns contiguous thereto, and a centrally supported print hammer capable of striking against the surface of the typedrum and spanning the space of two of the columns, the improvement comprising an impact tip on said hammer, said tip having a curvature starting on a plane at one edge thereof, receding to the midpoint of the tip to a plane farther from the surface of the typedrum than the first-mentioned plane, and advancing to said first-mentioned plane at the opposite edge, whereby a portion of the tip adjacent said one edge strikes part of one character prior to the time a portion of the tip adjacent the midpoint strikes another part of the same character.
  • a high-speed printer having a rotatable typedrum divided into sectors with characters embossed on the peripheral surface thereof, the characters being arranged in columns with one sector of columnar characters being offset from another sector of columnar characters, said character columns being spaced by blank portions, a plurality of a print hammers adaptable to be driven against the typedrum, each of said hammers being capable of spanning a character column and a blank portion in a respective sector of the typedrum, an impact tip for each print hammer.
  • the tip having a surface extending in one direction to cover a character width and an adjacent blank space and in the other direction to cover a character height, the surface having a curvature starting on a plane at one end of the tip and extending in the first-mentioned direction, receding from the plane to a maximum midway between the ends of the tip surface to a plane farther from the typedrum surface than the first-mentioned plane, and advancing to said first-mentioned plane at the other end of the tip whereby an outer portion of the impact tip surface strikes one edge of a character prior to an inner portion of the tip striking another edge of the character.
  • a print hammer centrally supported and adaptable to be driven into contact with said drum and formed to span a column of characters and a blank portion
  • the combination including an impact tip on said hammer extending across the face thereof laterally along the typedrum and having a surface curvature starting on a plane at one edge of the tip, uniformly receding in a direction toward the hammer support to a midpoint of the tip to a plane farther from the face of the drum than the first-mentioned plane, and unifonnly advancing to said first-mentioned plane at the opposite edge of the tip whereby one side of the tip face makes contact with a character at the time the other side spans a blank space and, by reason of the curvature of the tip face, one portion of a

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US798312A 1969-02-11 1969-02-11 Print hammer impact tip Expired - Lifetime US3604347A (en)

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Application Number Priority Date Filing Date Title
US79831269A 1969-02-11 1969-02-11

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US3604347A true US3604347A (en) 1971-09-14

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US798312A Expired - Lifetime US3604347A (en) 1969-02-11 1969-02-11 Print hammer impact tip

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US (1) US3604347A (xx)
BE (1) BE745441A (xx)
CH (1) CH506844A (xx)
DE (1) DE2005661A1 (xx)
FR (1) FR2033321A1 (xx)
GB (1) GB1247825A (xx)
SE (1) SE343416B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750794A (en) * 1970-12-01 1973-08-07 Burroughs Corp High speed print drum with traveling print hammer
US3795187A (en) * 1972-07-03 1974-03-05 Teletype Corp Impellers for impact printers
US4134337A (en) * 1977-06-10 1979-01-16 Dataproducts Corporation Concave impact print hammers
US4230039A (en) * 1977-05-20 1980-10-28 Citizen Watch Company Limited Drum printer with helically arranged type sets
US4315460A (en) * 1979-02-15 1982-02-16 Kabushiki Kaisha Sato Drum type line printer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654569C2 (de) * 1976-12-02 1987-02-05 Ibm Deutschland Gmbh, 7000 Stuttgart Drucker für unterschiedliche Zeichendichten
JPS53106220A (en) * 1977-02-28 1978-09-16 Canon Kk Printer

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776618A (en) * 1953-06-11 1957-01-08 Hughes Aircraft Co Printing cylinders for high-speed printing systems
US2805620A (en) * 1951-12-15 1957-09-10 Rosen Leo Control means for high speed printing apparatus
US2862592A (en) * 1956-02-28 1958-12-02 Sperry Rand Corp Type bar and interchangeable type therefor
US3090297A (en) * 1960-11-17 1963-05-21 Honeywell Regulator Co Mechanical apparatus
US3128693A (en) * 1961-06-09 1964-04-14 Potter Instrument Co Inc High speed printer drum
US3220343A (en) * 1960-11-25 1965-11-30 Potter Instrument Co Inc High speed printers with column spanning hammers
US3282204A (en) * 1964-05-15 1966-11-01 Sperry Rand Corp High speed printing device for printing characters of different physical sizes
US3309989A (en) * 1965-09-16 1967-03-21 Gen Electric Print hammer
US3361057A (en) * 1964-08-11 1968-01-02 Sperry Rand Corp High speed superscript-subscript printer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805620A (en) * 1951-12-15 1957-09-10 Rosen Leo Control means for high speed printing apparatus
US2776618A (en) * 1953-06-11 1957-01-08 Hughes Aircraft Co Printing cylinders for high-speed printing systems
US2862592A (en) * 1956-02-28 1958-12-02 Sperry Rand Corp Type bar and interchangeable type therefor
US3090297A (en) * 1960-11-17 1963-05-21 Honeywell Regulator Co Mechanical apparatus
US3220343A (en) * 1960-11-25 1965-11-30 Potter Instrument Co Inc High speed printers with column spanning hammers
US3128693A (en) * 1961-06-09 1964-04-14 Potter Instrument Co Inc High speed printer drum
US3282204A (en) * 1964-05-15 1966-11-01 Sperry Rand Corp High speed printing device for printing characters of different physical sizes
US3361057A (en) * 1964-08-11 1968-01-02 Sperry Rand Corp High speed superscript-subscript printer
US3309989A (en) * 1965-09-16 1967-03-21 Gen Electric Print hammer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750794A (en) * 1970-12-01 1973-08-07 Burroughs Corp High speed print drum with traveling print hammer
US3795187A (en) * 1972-07-03 1974-03-05 Teletype Corp Impellers for impact printers
US4230039A (en) * 1977-05-20 1980-10-28 Citizen Watch Company Limited Drum printer with helically arranged type sets
US4134337A (en) * 1977-06-10 1979-01-16 Dataproducts Corporation Concave impact print hammers
US4315460A (en) * 1979-02-15 1982-02-16 Kabushiki Kaisha Sato Drum type line printer

Also Published As

Publication number Publication date
BE745441A (fr) 1970-07-16
CH506844A (de) 1971-04-30
DE2005661A1 (de) 1971-01-07
GB1247825A (en) 1971-09-29
FR2033321A1 (xx) 1970-12-04
SE343416B (xx) 1972-03-06

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