US3696739A - Striking apparatus for rotating wheel printer - Google Patents

Striking apparatus for rotating wheel printer Download PDF

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Publication number
US3696739A
US3696739A US34323A US3696739DA US3696739A US 3696739 A US3696739 A US 3696739A US 34323 A US34323 A US 34323A US 3696739D A US3696739D A US 3696739DA US 3696739 A US3696739 A US 3696739A
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US
United States
Prior art keywords
bearing
lever
exciter
hammer
disc
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
US34323A
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English (en)
Inventor
Evan L Bagland
Robert L Wagner
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.)
AMERICAN REGITAL CORP
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AMERICAN REGITAL CORP
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Publication date
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Publication of US3696739A publication Critical patent/US3696739A/en
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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
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means
    • 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
    • B41J9/04—Hammers; Arrangements thereof of single hammers, e.g. travelling along printing line
    • 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
    • G06K15/06—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by type-wheel printers

Definitions

  • ABSTRACT Striking apparatus for a rotating wheel printer
  • the striking apparatus includes a hammer mounted on one end of a lever having an intermediate semicircular bearing portion mated with a pin where the bearing is maintained in engagement with the pin by a biasing spring.
  • An exciter includes a ram for impacting against the lever to move the hammer into contact with the printing wheel, the ram extending from a disc of magnetic material which is normally retained in the rest position by a permanent magnet but is attracted by a cup-core type electromagnet for causing the exciter to impact the lever to rotate the hammer into contact with the printing wheel.
  • the characteristics of the hammer that pushes the paper against the wheel are very critical.
  • the flight time of the hammer from the moment of its activation to impact must be constant and repeatable; otherwise the printed line of type will not be straight and characters may not be accurately printed.
  • striking apparatus for a rotating wheel printer.
  • This apparatus comprises lever means having a hammer mounted on one end juxtaposed with the wheel .and an intermediate bearing.
  • Bearing shaft means are adapted to mate with the bearing.
  • a mechanical exciter is supported for movement from a rest position to impact the lever means between the bearing and hammer on the opposite side of the lever means relative to the bearing to cause the hammer to move toward the wheel.
  • Biasing means are coupled to the other end of the lever means for maintaining the bearing in contact with the bearing shaft means.
  • Means are provided for retaining the exciter in the predetermined rest position. Actuator means propel the exciter means from the rest position to impact the lever means and mechanical stop means stop the motion of the exciter means and allow the hammer to free fly toward the wheel.
  • FIG. 1 is a plan view of apparatus embodying the invention.
  • FIG. 2 is a cross sectional view substantially taken along the line2--2 of FIG. 1.
  • FIG. 1 illustrates a rotating wheel printer where a printing wheel has embossed upon its periphery a number of characters 11.
  • the characters 11 are arranged in helix and the wheel which is mounted for rotation on a carriage is moved transverse along its axis on a rod 13. This is at a speed which is proportional to pitch of the helix.
  • Striking apparatus generally indicated at 14 includes a hammer 16 which is juxtaposed with the periphery of wheel 10.
  • the hammer unit 14 is similarly mounted on a shaft 17 for transverse movement, as indicated by the arrow 18, in unison with carriage 12.
  • Sheet material or paper 19 is placed between printing wheel 10 and hammer 16 and printing occurs when the hammer impacts paper 19 on wheel 10.
  • Shaft 13 and 17 are mounted on a frame 21.
  • the foregoing structure is shown in greater detail in a copending application entitled Double Helical Printer the name of Evan Ragland.
  • the striking apparatus 14 and rotating wheel 10 are continuously moved in synchronism.
  • the present invention is equally applicable to other wheel printing devices such as the type where the wheel and striking apparatus are indexed for each column of print.
  • the striking apparatus is shown in clearer detail and in partial cross sectional form in FIG. 2 where the hammer 16 is mounted on the end 22a of a lever 22.
  • an arcuate or semicircular cutout portion 23 which serves as a bearing. This mates with 'a bearing shaft or pin 24 fixed to a suitable frame better shown in FIG. 1 which mates with the bearing 23.
  • lever 22 rotates about the axis of shaft or pin 24.
  • Biasing means in the form of a compression spring 26 is coupled to other end 22c of lever 22 for maintaining bearing 23 in engagement with shaft 24.
  • One end of spring 26 is in inset portion 27 of lever 22 and the other end rests against a cup-core type electromagnet 28.
  • Support means 29 abut end portion 22a of the lever to resist the bias of spring 26.
  • the bearing 23 is maintained in engagement with pin 24 solely by the spaced parallel forces on opposite sides of the bearing, or on opposite ends 22a and 220 of the lever provided by the spring biasing means 26 and by the support means 29.
  • a mechanical exciter generally indicated at 31 is supported for movement from a rest position to impact lever 22 at a portion 32 on the lever which is between the bearing 23 and hammer l6 and on the opposite side of the lever relative to bearing 23 and pin 24. Such impact causes the hammer 16 to move toward the printer wheel, a portion thereof being indicated at 10.
  • the exciter includes a ram portion 33 having a tungsten carbide extension 34 which impacts lever 22 at the portion 32 which itself is hardened tool steel.
  • Ram 33 extends from a disc of magnetic material 36 and is adjustably affixed to the disc by an adjustable nut arrangement 37. In other words, ram portion 33 may be positioned along its axis relative to disc 36. Ram 33 is supported for movement in a self-lubricating sleeve 38 which is retained by the casing of cup-core 28.
  • the exciter 31 is normally retained in a predetermined rest position by permanent magnet means 39 which includes a cup shaped structure 40 of non-magnetic material having within it an annularly shaped permanent magnet 41 with appropriate polarities being material. Both the cup core 28 and disc 36 are slotted' to prevent any eddy currents.
  • the face 44 of cup core 28 forms a stopping surface for disc 36 to limit the travel of ram 33.
  • the stopping surface 44 is an integral part of the actuator means for actuating the exciter into impact with lever 22.
  • the ram 33 is adjusted by adjustable nut 37 with respect to disc 36 so that in a rest position the extension 34 is a predetermined distance away from lever 22. This is to ensure that there is no contact in the rest position with the lever.
  • the spacing of the end of extension 34 from lever 22 is however less than the spacing 46 of the bottom of disc 36 from the stopping surface 44 of the cup core 28. This insures that impact will take place before disc 36 is stopped. Spacing 46 in the preferred embodiment is of the order of 0.014 inches.
  • lever 22 After disc 36 is stopped by surface 44 lever 22 still free flies a predetermined distance into impact with wheel 10. This free flight allows for easy rebound of the hammer 16 from the wheel. Typical distances for the free flight zone in the preferred embodiment are 0.040 inches with 0.100 inches being the distance that the hammer 16 is moved with the exciter in contact with lever 22. Such distances are respectively indicated at 47 and 48.
  • the semicircular half bearing 23 of lever 22 in addition to eliminating excess weight which would occur with a full bearing also minimizes the effects of bearing wear. Because of the particular biasing by spring 26, bearing wear when it occurs merely somewhat deepens the semicircular recess 23 and because of the eveness of the wear no wobble is produced as would be the case with a full bearing in other types of actuating devices. Moreover, the placement of the ram portion 33 on the opposite side of the bearing as opposed to the biasing spring 26 also provides for more even wear. The mass of the lever 22 is also reduced since a full 360 bearing would in effect double the thickness of the intermediate lever portion 22b. Thus the arcuate 180 bearing formed by a cutout in a surface of the lever provides a large bearing area in relation to the mass of the lever.
  • the present invention has provided an improved striking apparatus for a rotating wheel printer which because of the minimization of bearing wear has a repeatable flight time to provide for accurate printing.
  • Striking apparatus for a rotating wheel printer comprising: lever means having a hammer mounted on one end juxtaposed with and spaced from said wheel and an intermediate bearing; bearing shaft means adapted to mate with said bearing; a mechanical exciter including a ram portion extending from a disc of magnetic material, said ram and disc being supported from movement from a rest position to a position in which said ram portion impacts said lever means between said bearing and said hammer on the opposite side of the lever means relative to said bearing to cause said hammer to move toward said wheel; biasing means coupled to the other end of said lever means for maintaining said bearing in engagement with said bearing shaft means; means for retaining said exciter in said predetermined rest position; actuator means for propelling said exciter means from said rest position so that the ram portion impacts said lever means, said actuator means including a normally de-energized electromagnet through which said ram portion is slidably mounted, said electromagnet when energized attracting said disc to cause said ram to impact said lever means; and mechanical stop means for stopping
  • Apparatus as in claim 1 where said means for retaining said exciter in said rest position includes permanent magnet means for attracting said disc to said rest position and maintaining said disc in said position.
  • stop means is an integral part of said actuator means said stop means including a face of said electromagnet which forms a stopping surface for said disc when attracted by said electromagnet.
  • Striking apparatus for a rotating wheel printer comprising: lever means having a hammer mounted on one end juxtaposed with and spaced from said wheel, and an intermediate bearing formed in one face of said lever means by an arcuate cutout portion of substantially 180said one face forming an elongated planar surface extending substantially from said bearing to said one end; shaft means mating with said bearing, the center of said shaft means substantially lying in a plane formed by said elongated planar surface of said lever means whereby a large bearing area is provided relative to the mass of said lever means; a mechanical exciter for impacting said lever means between said bearing and said hammer on the opposite side of the lever means relative to said bearing to cause said hammer to move toward said wheel; normally de-energized electromagnetic actuating means in which said exciter is slidably mounted, said actuating means when energized propelling said exciter to impact said lever means; support means for contacting said opposite side of said lever means near said one end and biasing means coupled to the other end of said lever means,
  • said biasing means is a compression spring having one end inset in said end of said lever means.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Impact Printers (AREA)
US34323A 1970-05-04 1970-05-04 Striking apparatus for rotating wheel printer Expired - Lifetime US3696739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3432370A 1970-05-04 1970-05-04

Publications (1)

Publication Number Publication Date
US3696739A true US3696739A (en) 1972-10-10

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ID=21875706

Family Applications (1)

Application Number Title Priority Date Filing Date
US34323A Expired - Lifetime US3696739A (en) 1970-05-04 1970-05-04 Striking apparatus for rotating wheel printer

Country Status (6)

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US (1) US3696739A (de)
JP (1) JPS5215003B1 (de)
CA (1) CA928144A (de)
DE (1) DE2121290A1 (de)
FR (1) FR2091088A5 (de)
GB (1) GB1295414A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983806A (en) * 1973-12-10 1976-10-05 Data Products Corporation Hammer bank assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018155A (en) * 1975-06-02 1977-04-19 Mohawk Data Sciences Corporation Ballistic print hammer assembly
US4070963A (en) * 1976-04-12 1978-01-31 Anadex, Inc. Impact line printer
US4550302A (en) * 1982-11-09 1985-10-29 Matsushita Electric Industrial Co., Ltd. Solenoid
DE3420450A1 (de) * 1984-06-01 1985-12-05 Olympia Werke Ag, 2940 Wilhelmshaven Druckhammerwerk fuer eine schreib- oder aehnliche bueromaschine mit einem schwenkbaren druckhammer

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001469A (en) * 1958-06-25 1961-09-26 Int Computers & Tabulators Ltd Data registering apparatus
US3072045A (en) * 1958-06-02 1963-01-08 Bull Sa Machines Triggering electronic devices for the control of electromagnetic actuating devices
US3110250A (en) * 1961-10-20 1963-11-12 Potter Instrument Co Inc Printer hammer assembly
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
US3156180A (en) * 1961-09-18 1964-11-10 Holley Comp Products Company Permanent magnet hammer module in high speed printers
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly
US3209682A (en) * 1962-08-30 1965-10-05 Ibm Type carrier for high speed printer
US3266418A (en) * 1963-12-02 1966-08-16 Anelex Corp Print hammer assembly for high speed printers
US3308749A (en) * 1965-05-24 1967-03-14 Ibm Print impression control for specially configured type elements
US3349696A (en) * 1965-08-16 1967-10-31 Potter Instrument Co Inc Hammer module assembly in high speed printers
US3354816A (en) * 1966-09-19 1967-11-28 Ibm Line printer with proportional spacing control means
US3504623A (en) * 1968-04-03 1970-04-07 Itt Hammer arrangement for high-speed printers
US3643594A (en) * 1968-06-11 1972-02-22 Sits Soc It Telecom Siemens Print hammer for high-speed printer

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072045A (en) * 1958-06-02 1963-01-08 Bull Sa Machines Triggering electronic devices for the control of electromagnetic actuating devices
US3001469A (en) * 1958-06-25 1961-09-26 Int Computers & Tabulators Ltd Data registering apparatus
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
US3156180A (en) * 1961-09-18 1964-11-10 Holley Comp Products Company Permanent magnet hammer module in high speed printers
US3110250A (en) * 1961-10-20 1963-11-12 Potter Instrument Co Inc Printer hammer assembly
US3209682A (en) * 1962-08-30 1965-10-05 Ibm Type carrier for high speed printer
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly
US3266418A (en) * 1963-12-02 1966-08-16 Anelex Corp Print hammer assembly for high speed printers
US3308749A (en) * 1965-05-24 1967-03-14 Ibm Print impression control for specially configured type elements
US3349696A (en) * 1965-08-16 1967-10-31 Potter Instrument Co Inc Hammer module assembly in high speed printers
US3354816A (en) * 1966-09-19 1967-11-28 Ibm Line printer with proportional spacing control means
US3504623A (en) * 1968-04-03 1970-04-07 Itt Hammer arrangement for high-speed printers
US3643594A (en) * 1968-06-11 1972-02-22 Sits Soc It Telecom Siemens Print hammer for high-speed printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983806A (en) * 1973-12-10 1976-10-05 Data Products Corporation Hammer bank assembly

Also Published As

Publication number Publication date
DE2121290A1 (de) 1972-10-05
JPS5215003B1 (de) 1977-04-26
GB1295414A (de) 1972-11-08
FR2091088A5 (de) 1972-01-14
CA928144A (en) 1973-06-12

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