US3611922A - Front printer - Google Patents
Front printer Download PDFInfo
- Publication number
- US3611922A US3611922A US853752A US3611922DA US3611922A US 3611922 A US3611922 A US 3611922A US 853752 A US853752 A US 853752A US 3611922D A US3611922D A US 3611922DA US 3611922 A US3611922 A US 3611922A
- Authority
- US
- United States
- Prior art keywords
- document
- slug
- interposer
- hammer
- slugs
- 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
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/08—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by flight printing with type font moving in the direction of the printed line, e.g. chain printers
-
- 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
- B41J1/20—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on endless bands or the like
Definitions
- Each slug is associated with a particular interposer and both are mounted in a continuous chain which moves across the document at the print line and is located on the same side of the document as are the hammers.
- the interposers are resiliently mounted in the chain and the slugs are biased away from the document and maintained in contact with the interposers.
- each slug is partially located in an open-ended bore within its associated interposer and has a flanged end on which a type character is located projecting out of the bore.
- the slugs flange is maintained in contact with the open end of the interposer and the centroids of the slug and interposer are aligned perpendicular to the document and along the center of the bore.
- an impact force on the interposer is transmitted to the flange of the slug to drive the slug toward, and perpendicular to the document.
- This invention relates to high-speed printers and, more particularly, to those printers which are commonly called front printers," i.e., printers in which the entire printing mechanism is located on one side of the document being printed upon.
- printers have been developed to print the output information of data processing apparatus.
- a plurality of print hammers are arranged along the line at which characters are to be printed (i.e., the print line) and selectively strike an inked ribbon and document to force them against type characters on drum or continuous chain revolving at high speed on the other side of the document.
- the document being printed upon is generally a paper sandwich" made up of alternating sheets of paper and carbon with the top and bottom sheets being paper.
- the ribbon provides the ink for the topmost sheet of paper.
- the print slugs must travel in a true path perpendicular to the document.
- the hammers must impact the slugs in a direction perpendicular to the document.
- they must strike the slugs squarely and in line with the centers of the slugs. Deviation from these conditions causes wear and vibration problems as well as poor print registration.
- each slug's direction of movement depends almost solely on its relationship with an interposer, the directions in which the hammers move when activated are not limiting. Similarly, the timing of hammer activation is not critical as long as sufficient portions of the hammers strike the interposes to impart forces on the selected slugs toward the document. Also, the hammers need not strike squarely as is necessary when the slugs are struck directly.
- FIG. 1 is a schematic perspective view of a preferred embodiment of the printer.
- FIG. 2 is a view, partly in section, showing the hammers and the print chain in which the print slugs and interposers are mounted.
- FIG. 3 is a view showing one of the hammers and a section through the print chain.
- FIG. 1 shows a front printer printing upon a document comprising a paper sandwich l which is moved an increment in the direction shown after each line is printed.
- the document I has edge perforations la which are engaged by a suitable means for moving the document, such as sprocket teeth 2a on a rotatable drum 2.
- Printing is accomplished by driving print slugs, which are mounted within a continuous print chain 3 (schematically illustrated), against the document.
- the drum 2 also provides the anvil surface necessary to resist the forces of the print slugs on the document.
- the entire printing mechanism is located on one side of the document and mounted on a base 4.
- the print chain 3 revolves around driving and idler pulleys, 5a and 5b.
- the driving pulley ra is connected to the shaft 6a of a motor 6.
- the print chain revolves in a plane substantially parallel to the document at the print line. It moves across the document at the print line between upper and lower guide members, 7 and 8.
- the guide members are located in the same plane as the chain and thus assure vertical registration of the print characters on the document.
- a plurality of print hammers 9 are provided to drive selected slugs mounted in the print chain against the document.
- Each print slug has mounted thereon an individual type character.
- the type characters make up one or more fonts.
- the print chain moves at a constant speed in a fixed continuous path and a conventional code disc 10 is mounted on the motors shaft 60. It contains a plurality of slots which represent the moving type characters and also an additional slot for indicating the end of each font.
- Light from a light source 11 is directed onto the code disc and passes through the slots therein and onto a photosensitive unit 12.
- the photosensing unit produces electrical outputs representing the positions of the type characters on the slugs within the moving print chain 3. Such electrical signals are then used to properly time the activation of the hammers 9.
- An inked ribbon 13 is located between the document 1 and the print chain 3 at the print line.
- the ribbon is fed from a supply spool a to a takeup spool 14b.
- a print slug is driven toward the paper sandwich, the print ribbon is forced against the topmost sheet to form an impression thereon.
- the print chain is shown interposed between the hammers 9 and the ribbon l3, document 1 and drum 2.
- the print chain 3 comprises a plurality of separable slug carriers 15, one of which is shown in section.
- Each carrier 15 has mounted therein two print slugs 16.
- Each print slug is made up of a straight portion 16a having a flange 16b at one of its ends.
- the type character 17 associated with each slug is mounted on the flanged end.
- Also mounted within each slug carrier is a pair of interposers 18, each of which is associated with one of the slugs l6 and located between that slug and the hammers.
- Each interposer is mounted in the carrier with a resilient bushinglike member 19.
- the interposers each contain an open ended bore 18a within which is tightly fitted the straight portion 16a of a print slug.
- the bore 18a extends perpendicular to the document 1.
- Each slug has attached thereto a leaf spring 20 which is connected to the slug carrier by projecting through a slot in one of the interposers.
- the leaf spring 20 maintains the slug's flange 16a in contact with the open end of its associateed interposer and returns the slug after it has been driven toward the document.
- the print chain 3 also comprises a flexible toothed endless belt 21 whose teeth 22 mesh with peripheral notches (not shown) in pulleys a and 5b.
- Each slug carrier contains a pair of flanges 23 which project across the edges of the belt 21 and cooperate with pins 24 to secure the slug carrier to the belt.
- the pins 24 project through holes in the flanges 23 and bores in selected teeth 22 on the belt.
- the pulleys, 5a and 5b project between the flanges 23 on the carriers 15 to drivingly engage the belt.
- each hammer 9 rotates in an arc about a pivot 9! when activated by energization of an electromagnet 90 to force its striking surface 9d against an interposer 18.
- each hammer is T-shaped in cross section with its flange being adapted to strike the interposers.
- a spring (not shown) is used to return the hammer to its unactivated position.
- a stop plate 25 is secured to the bottom guide member 8 to inhibit the print chain from moving toward the document when the interposers are struck by the hammers.
- the operation of the printer is as follows.
- a selected hammer is activated to drive the slug 16 on which the type character is mounted against the ribbon l3 and document 1.
- the selected hammer strikes the interposer 18 which is associated with the selected slug and, since the open end of the interposer is in contact with the flange 16b of the slug, the force of the hammer is transmitted to the slug, driving it along the interposers bore 18a and perpendicular to the document.
- the resilient-mounting member 19 of the interposer confines the impact force from the hammer to the particular interposer-slug combination which is struck.
- hammer impact would cause those slugs adjacent to the one associated with the struck interposer to be driven toward the document.
- the hammer need not strike the interposer squarely since the slug moves perpendicular to the document along the interposers bore. Neither the angle at which the hammer moves nor the configuration of the striking surface of the hammer affects the slugs direction of move ment.
- the hammers need be timed only to strike enough of the interposer to drive the slug toward the document.
- the hammer strikes the interposer at the harnmers center of percussion.
- the mass of each hammer is approximately equal to the mass of each slug so that the hammers stop upon their impact with the interposers.
- the hammers illustrated in the drawing are T-shaped in cross section to minimize their mass.
- the slug is guided in its movement toward the document by being located within the bore 18a of the interposer, such external guidance is not necessary in practicing the invention. Without external guidance, the direction of travel of the slug is approximately along a line joining the centroids of the interposer and slug since the slug is maintained in contact with the interposer prior to being driven by the hammer. The direction from which the hammer impacts the interposer has no bearing on the direction of the slugs travel.
- the interposers 18 are square in cross section and their bores 1911 are also square and centrally located. Both the straight sections and the flanges 16b of the slugs are preferably square with each flange being symmetrically located on its attached straight portion. This arrangement locates the centroids of associated interposers and slugs on a line perpendicular to the document and in the center of the bore. Along with the guidance provided by the bores, the centroid alignment causes the slugs to move perpendicular to the document in response to hammer impact.
- a printer comprising:
- each interposer being associated with one of the slugs, adapted to be struck by the hammer and located between the hammer and its associated slug such that at least some of the force of the hammer upon the interposer is transmitted to the slug to drive its type character toward the document.
- the printer as recited in claim 1 including biasing means for maintaining contact between each pair of associated interposers and slugs.
- the moving member comprises an endless moving chain adapted to move across the document at the print line and moving in a plane substantially parallel to the document.
- a printer comprising:
- each interposer being associated with one of the slugs and the centroids of each pair of associated interposers and slugs being aligned essentially perpendicular to the document, each interposer being adapted to be struck by the hammer and located between the hammer and its associated slug such that at least some of the force of the hammer upon the interposer is transmitted to the slug to drive its type character toward the document;
- biasing means for maintaining contact between each pair of associated interposers and slugs.
- a printer comprising:
- each interposer being associated with one of the slugs and containing an open ended bore within which a portion of its associated slug is located, the bore being aligned essen-' tially perpendicular to the document, each interposer being adapted to be struck by the hammer and located between the hammer and its associated slug such that at least some of the force of the hammer upon the interposer is transmitted to the slug to drive its type character toward the document.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Impact Printers (AREA)
Abstract
Description
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US85375269A | 1969-08-28 | 1969-08-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3611922A true US3611922A (en) | 1971-10-12 |
Family
ID=25316800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US853752A Expired - Lifetime US3611922A (en) | 1969-08-28 | 1969-08-28 | Front printer |
Country Status (1)
Country | Link |
---|---|
US (1) | US3611922A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3893390A (en) * | 1972-05-01 | 1975-07-08 | Honeywell Inf Systems | Printer with rectilinear type-carrying belt |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2893313A (en) * | 1958-03-17 | 1959-07-07 | George H Pekar | High speed printer |
US2897752A (en) * | 1956-12-28 | 1959-08-04 | Ibm | High speed printing apparatus |
US3399619A (en) * | 1966-09-19 | 1968-09-03 | Mohawk Data Sciences Corp | Type arrangement in endless band line printers |
-
1969
- 1969-08-28 US US853752A patent/US3611922A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2897752A (en) * | 1956-12-28 | 1959-08-04 | Ibm | High speed printing apparatus |
US2893313A (en) * | 1958-03-17 | 1959-07-07 | George H Pekar | High speed printer |
US3399619A (en) * | 1966-09-19 | 1968-09-03 | Mohawk Data Sciences Corp | Type arrangement in endless band line printers |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3893390A (en) * | 1972-05-01 | 1975-07-08 | Honeywell Inf Systems | Printer with rectilinear type-carrying belt |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MOHAWK SYSTEMS CORPORATION, A DE CORP Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MOHAWK DATA SCIENCES CORP., A NY CORP;REEL/FRAME:004596/0913 Effective date: 19860502 Owner name: MOMENTUM SYSTEMS CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:MOHAWK SYSTEMS CORPORATION;REEL/FRAME:004596/0879 Effective date: 19860502 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON, THE, 100 FEDERAL ST Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MONMENTUM SYSTEMS CORPORATION;REEL/FRAME:005142/0446 Effective date: 19880901 |
|
AS | Assignment |
Owner name: DECISION DATA INC., A CORP. OF DE, PENNSYLVANIA Free format text: CHANGE OF NAME;ASSIGNOR:MOMENTUM SYSTEMS CORPORATION, A CORP. OF DE;REEL/FRAME:006673/0857 Effective date: 19920521 |
|
AS | Assignment |
Owner name: NATIONSBANK OF TEXAS, N.A., AS AGENT, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FIRST NATIONAL BANK OF BOSTON, AS AGENT;REEL/FRAME:007846/0256 Effective date: 19951020 |