US2995082A - Type hammer mechanism for high speed printer - Google Patents

Type hammer mechanism for high speed printer Download PDF

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Publication number
US2995082A
US2995082A US817790A US81779059A US2995082A US 2995082 A US2995082 A US 2995082A US 817790 A US817790 A US 817790A US 81779059 A US81779059 A US 81779059A US 2995082 A US2995082 A US 2995082A
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US
United States
Prior art keywords
hammers
high speed
type hammer
hammer mechanism
speed printer
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
US817790A
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English (en)
Inventor
Sasaki Rentaro
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Application granted granted Critical
Publication of US2995082A publication Critical patent/US2995082A/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
    • 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

Definitions

  • the present invention relates to the type hammer mechanism of high speed printers, e.g. for printing information issuing from electric computers and in which the printing types are secured to an endless belt rotating at high speed.
  • the spacing of the type is usually 2.5 mm. and if the printing hammers, one of which is provided at each printing point along the chosen line of type, are arranged so that the printed letters maintain this spacing, the cross sectional width of each hammer becomes very small and in consequence the cross sectional length thereof has to be relatively large in order to maintain its mechanical strength. Furthermore, such hammers are normally spring loaded by means of helical springs inset into the hammers and since the outer diameter of these springs is generally greater than the cross sectional width of the said hammers, adjacent springs tend to come into contact with one another and interfere with the working of the hammers.
  • the Object of the present invention is to provide an arrangement which will facilitate the close spacing of the hammers without risk of adjacent springs coming into contact or fouling one another, and which will give a suitable mechanical strength to the hammers while employing helical springs of small diameter.
  • a type hammer mechanism comprising a series of hammers mounted for guided longitudinal movement with respect to support means providing guide grooves for the hammers and a series of coil springs which will be energized by the movement of the hammers and serve to return the hammers to their initial position, the hammers each having a longitudinal recess and the springs being seated in separate grooves in an underlying support therefor so as to be partially accommodated in the said recesses.
  • FIG. 1 is a front elevation of the type hammer mechanism according to the present invention
  • FIG. 2. is a cross sectional view taken on line lI-II of FIG. 1
  • FIG. 3 is an enlarged fragmentary view of part of the mechanism in perspective.
  • the said mechanism comprises a channel-shaped container or block, the side walls 4, 4' of which are grooved at 3, 3' to provide comb-like guides for the hammers 6.
  • a plate 2 which is provided with a series of semi-cylindrical grooves 1 which extend between each pair of opposed slots, 3, 3' and which form seats for the helical springs 5.
  • Hammers 6 are each provided with undercut recesses 7, which fit over and partially contain the ends of springs 5. The arrangement is accordingly such that, when the hammers are moved axially in the direction of the arrows (FIGS. 2 and 3), the recoil spring 5 will be guided and compressed and will serve to return the hammers to their normal position.
  • the hammers 6 are retained in the grooves 3, 3 by cover plate 8.
  • a type hammer mechanism for high speed printers or the like comprising a channel-shaped container having upstanding opposed side walls formed with pairs of opposed slots located at spaced intervals, type hammers, each being supported by said container, said type hammers each being guidingly retained in a pair of said opposed slots, the interior of said container beneath each type hammer being formed with a semi-cylindrical groove extending between each pair of slots, the underside of each type hammer being provided with an undercut recess, and a recoil spring for each type hammer, each spring being partially retained in one of said semicylindrical grooves and partially in said undercut recess of each type hammer.

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  • Impact Printers (AREA)
  • Electrophonic Musical Instruments (AREA)
US817790A 1958-06-20 1959-06-03 Type hammer mechanism for high speed printer Expired - Lifetime US2995082A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3133158 1958-06-20

Publications (1)

Publication Number Publication Date
US2995082A true US2995082A (en) 1961-08-08

Family

ID=12328259

Family Applications (1)

Application Number Title Priority Date Filing Date
US817790A Expired - Lifetime US2995082A (en) 1958-06-20 1959-06-03 Type hammer mechanism for high speed printer

Country Status (4)

Country Link
US (1) US2995082A (fr)
DE (1) DE1120472B (fr)
FR (1) FR1227186A (fr)
GB (1) GB918770A (fr)

Cited By (3)

* 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
US3315597A (en) * 1964-01-24 1967-04-25 Olympia Werke Ag Print member guide and return means for selective printing machines
US3570646A (en) * 1967-06-27 1971-03-16 Burroughs Corp Convertible type carrier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1455555A (en) * 1916-07-24 1923-05-15 Rockford Milling Machine Compa Adding machine
US1780674A (en) * 1927-03-04 1930-11-04 Tabulating Machine Co Compound type bar
US1978898A (en) * 1933-07-26 1934-10-30 Ibm Printing device
US2494014A (en) * 1943-03-27 1950-01-10 Powers Samas Account Mach Ltd Printing element for typewriter printing machines
US2606491A (en) * 1948-10-16 1952-08-12 Burroughs Adding Machine Co Type bar

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745629C (de) * 1938-07-26 1944-03-21 Venturo Ab Elektrische Fernschreibmaschine
US2588190A (en) * 1946-06-13 1952-03-04 Burroughs Adding Machine Co Analyzer and transfer unit in tabulating and like machines
US2831424A (en) * 1954-03-01 1958-04-22 Burroughs Corp Traveling type carriage in high speed printers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1455555A (en) * 1916-07-24 1923-05-15 Rockford Milling Machine Compa Adding machine
US1780674A (en) * 1927-03-04 1930-11-04 Tabulating Machine Co Compound type bar
US1978898A (en) * 1933-07-26 1934-10-30 Ibm Printing device
US2494014A (en) * 1943-03-27 1950-01-10 Powers Samas Account Mach Ltd Printing element for typewriter printing machines
US2606491A (en) * 1948-10-16 1952-08-12 Burroughs Adding Machine Co Type bar

Cited By (3)

* 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
US3315597A (en) * 1964-01-24 1967-04-25 Olympia Werke Ag Print member guide and return means for selective printing machines
US3570646A (en) * 1967-06-27 1971-03-16 Burroughs Corp Convertible type carrier

Also Published As

Publication number Publication date
GB918770A (en) 1963-02-20
DE1120472B (de) 1961-12-28
FR1227186A (fr) 1960-08-19

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