US3673955A - Means detecting non-rebailed print hammers to recycle the bailing means - Google Patents

Means detecting non-rebailed print hammers to recycle the bailing means Download PDF

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Publication number
US3673955A
US3673955A US57103A US3673955DA US3673955A US 3673955 A US3673955 A US 3673955A US 57103 A US57103 A US 57103A US 3673955D A US3673955D A US 3673955DA US 3673955 A US3673955 A US 3673955A
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United States
Prior art keywords
hammers
printer
bailing
radiation
cycle
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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
US57103A
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English (en)
Inventor
Robert H Curtiss
Richard Holzman
Seldan A Lazarow
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.)
Data 100 Corp
NORTEC COMPUTER DEVICES Inc
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NORTEC COMPUTER DEVICES Inc
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.)
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Application filed by NORTEC COMPUTER DEVICES Inc filed Critical NORTEC COMPUTER DEVICES Inc
Application granted granted Critical
Publication of US3673955A publication Critical patent/US3673955A/en
Assigned to NORTHERN TELECOM INC. reassignment NORTHERN TELECOM INC. CERTIFIED COPY OF MERGER FILED IN THE OFFICE OF THE SECRETARY OF STATE OF DELAWARE, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON DEC. 17, 1980, EFFECTIVE DEC. 31, 1980 Assignors: NORTHERN TELECOM SYSTEMS CORPORATIO A CORP. OF MN. (MERGED INTO)
Assigned to DATA 100 CORPORATION reassignment DATA 100 CORPORATION CERTIFIED COPY OF A CERTIFICATE FILED IN THE OFFICE OF THE SECRETARY OF STATE OF MINNESOTA, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON MAY 30, 1979 EFFECTIVE AY 31, 179, Assignors: NORTHERN TELECOM COMPUTERS, INC., A CORP. OF DE.
Assigned to DATA 100 CORPORATION, A MN CORP. reassignment DATA 100 CORPORATION, A MN CORP. ASSIGNS NUNC PRO TUNC AS OF DECEMBER 31, 1977 THE ENTIRE INTEREST IN SAID PATENTS. Assignors: IOMEC, INC., A CORP. OF DE
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
    • B41J9/44—Control for hammer-impression mechanisms
    • B41J9/52—Control for hammer-impression mechanisms for checking the operation of print hammers

Definitions

  • Pulfrey [73] Ass1gnee: Nortec Computer Devices, Inc., Southboro, Assistam g Coven Mass- AttorneyDanie1 M. Rosen 22 F'] d: 1 22,1 7 l 1 y 9 0 57 ABSTRACT ⁇ 21]
  • Appl' SL103 A printer is disclosed having a number of hammers aligned along a transverse axis which hammers are in a cocked posi- [52] US. Cl. ..101/93 C, 235/58 P, 197/187 tion awaiting a print signal, means for simultaneously bailing [51] Int. Cl.
  • This invention relates to printers having means to detect hammers which have not been properly positioned and more particularly to such printers having means to properly position hammers so improperly positioned upon detection of such condition.
  • High speed printers require hammers which must be actuated at the precise time that type is moving into the print position. In order to assure proper actuation, the hammer must be positioned so that it may receive the full driving force and impact the paper with proper velocity at the proper time.
  • hammers are driven by electromagnetic means.
  • some printers employ hammers which are mechanically bailed and held in the cocked position obtaining the drive force by springs which are under tension when the hammers are cocked.
  • springs which are under tension when the hammers are cocked.
  • the stored energy in the cocked spring either aids the electromagnetic drive or has sufiicient'energy in itself to drive the hammers to impact. In any case it is important that the hammers be precisely positioned prior to application of drive or release pulses.
  • the invention may be accomplished by optical detecting apparatus positioned along the line of print hammers just forward of the hammer faces when in their preprint position. If radiation from an emitting source is blocked by a hammer and not received at the other end of the line of hammers one or more hammers are improperly positioned.
  • Each hammer 11 contains an arm .13 supported by two reed springs 15 in a suitable base or frame 17.
  • a flat striking face 19 impacts one of: the print medium; ribbon; or type carrier (not shown), compressing them together to cause printing.
  • the hammers 11 are shown in a rest position.
  • a bailing arm 21 is driven counter-clockwise about shaft 23 by bailing motor 25 to cause bail bar 27 which extends the length of all the anus 13 to contact the bottom surface of arms 13 to push them against magnetic pole pieces 29.
  • the hammers are held in the cocked position by the magnetic field emanating from pole pieces 29. Bailing bar 27 is returned to the position shown.
  • coil 31 on pole piece 29 receives a pulse of electrical energy over leads 33 sufficient to counteract the holding force of the pole piece 29 and the hammer is released from the cocked position to an impact or print position forward of the rest position shown.
  • the released hammer arm 13 rebounds from the print position, is suitably damped by means (not shown) and returns to the rest position. After a print cycle is completed, hammers that are released during that cycle are rebailed.
  • an electro-optical system is placed along an optical axis 35 parallel to the transverse axis of the hammers 11 just forward of the location of striking faces 19 when the arms 13 are in the cocked position.
  • the electro-optical system includes a light emitting diode 37 having a lead 39 from its anode and a lead 41 from its cathode connected to the printer logic circuitry 43, a collimating lens 45 is placed proximate to the diode 37 and a photosensitive transistor 49 having emitter and collector leads, 53 and 55, connected to the logic circuitry 43, is placed at the other end of the line of hammer arms 13.
  • the effect is one produced by no signal received by logic 43. If any of these conditions occur, the logic 43 reactivates the bailing motor 25 to cock these hammer arms 13 which are blocking the transmitted light. Following the completion of the rebailing cycle, the diode 37 is again pulsed to determine if all hammers are in the cocked position. The rebailing cycle may continue N times where N is any positive integer between zero and a high value dependent upon the particular logic 43 employed. Following the last ineffective bailing cycle the logic 43 emits a signal over lead 46 to an alarm 47 which notifies an operator that a failureexists. The signal over lead 46 also shuts down the printer, awaiting attention from an operator. Shut down is generally not a complete loss of power since any data stored in the printer might be lost if all power were removed,
  • the logic 43 may consist of any suitable response mechanism for accomplishing the foregoing functions.
  • the logic may comprise a plurality of relays which will respond to the radiation signal for activating the bailing motor 25 and the alarm 47, as well as energizing the diode 37 in response to the end of a bailing cycle.
  • Other modes of operation will be apparent to those skilled in the art, and the actual construction of such logic is not part of the invention.
  • shut down may occur after the initial bailing cycle or after any number of rebailing cycles.
  • the electro-optical system is only activated for a short period following a bailing or rebailing cycle. Therefore the life of the system is enhanced.
  • the system is a fail safe system since any failure in the electro-optical system will cause the lack of a proper signal to logic 43 and will cause the alarm 47 to be activated.
  • Typical elements that may be used in the electro-optical system are: Gallium Arsenide High Efi'rciency Emitting Diode available from the Radio Corporation of America, identification number 40736R, which diode emits infra-red radiation; Double Convex Lens available from Edmund Scientific Co.; and NPN Silicon Photo Transistor available from Motorola Corporation, identification number MRD 450.
  • a printer having a print cycle and a bailing cycle comprising a plurality of print hammers each individually actuatable during a print cycle from a first to a second position for printing, repositioning means engageable with each of said hammers for repositioning said hammers from said second position to said first position during a bailing cycle, optical generating means providing an optical beam along an optical path along an axis intersecting a print hammer in said second position, detecting means positioned in said axis for detecting an absence of said optical beam after a bailing cycle indicating a hammer present in said second position after a bailing cycle and means responsive to the detection by said detecting means of said absence of said beam for reactivating said repositioning means.
  • said optical generating means includes a source of radiation and said detecting means an electro-optical transducer to receive said radiation whereby said radiation is blocked by at least one of said hammers which is not in said first position.

Landscapes

  • Impact Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Ink Jet (AREA)
US57103A 1970-07-22 1970-07-22 Means detecting non-rebailed print hammers to recycle the bailing means Expired - Lifetime US3673955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5710370A 1970-07-22 1970-07-22

Publications (1)

Publication Number Publication Date
US3673955A true US3673955A (en) 1972-07-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US57103A Expired - Lifetime US3673955A (en) 1970-07-22 1970-07-22 Means detecting non-rebailed print hammers to recycle the bailing means

Country Status (4)

Country Link
US (1) US3673955A (cs)
JP (1) JPS509614B1 (cs)
DE (1) DE2055202A1 (cs)
GB (1) GB1286882A (cs)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811615A (en) * 1973-03-12 1974-05-21 Ncr Co Recording device control system
US3874287A (en) * 1973-06-05 1975-04-01 Honeywell Bull Sa Printing machines
US3905294A (en) * 1973-02-16 1975-09-16 Pertec Corp High speed line printing apparatus
US3998313A (en) * 1973-04-16 1976-12-21 Docutel Corporation Paper web and ink ribbon feed control for character printer
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
US4233894A (en) * 1978-06-02 1980-11-18 Printronix, Inc. Print hammer mechanism having dual pole pieces
DE3228546A1 (de) * 1981-07-30 1983-03-03 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka Druckwerk
US4379428A (en) * 1979-07-24 1983-04-12 Burroughs Corporation Hammer locating and operational means
US4675841A (en) * 1974-12-23 1987-06-23 Pitney Bowes Inc. Micro computerized electronic postage meter system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905294A (en) * 1973-02-16 1975-09-16 Pertec Corp High speed line printing apparatus
US3811615A (en) * 1973-03-12 1974-05-21 Ncr Co Recording device control system
US3998313A (en) * 1973-04-16 1976-12-21 Docutel Corporation Paper web and ink ribbon feed control for character printer
US3874287A (en) * 1973-06-05 1975-04-01 Honeywell Bull Sa Printing machines
US4675841A (en) * 1974-12-23 1987-06-23 Pitney Bowes Inc. Micro computerized electronic postage meter system
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
US4233894A (en) * 1978-06-02 1980-11-18 Printronix, Inc. Print hammer mechanism having dual pole pieces
US4379428A (en) * 1979-07-24 1983-04-12 Burroughs Corporation Hammer locating and operational means
DE3228546A1 (de) * 1981-07-30 1983-03-03 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka Druckwerk
US4472072A (en) * 1981-07-30 1984-09-18 Matsushita Electric Industrial Co., Ltd. Printing apparatus

Also Published As

Publication number Publication date
GB1286882A (en) 1972-08-23
DE2055202A1 (de) 1972-01-27
JPS509614B1 (cs) 1975-04-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NORTHERN TELECOM INC., STATELESS

Free format text: CERTIFIED COPY OF MERGER FILED IN THE OFFICE OF THE SECRETARY OF STATE OF DELAWARE, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON DEC. 17, 1980, EFFECTIVE DEC. 31, 1980;ASSIGNOR:NORTHERN TELECOM SYSTEMS CORPORATIO A CORP. OF MN. (MERGED INTO);REEL/FRAME:004006/0661

Effective date: 19800918

Owner name: DATA 100 CORPORATION, STATELESS

Free format text: CERTIFIED COPY OF A CERTIFICATE FILED IN THE OFFICE OF THE SECRETARY OF STATE OF MINNESOTA, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON MAY 30, 1979 EFFECTIVE AY 31, 179,;ASSIGNOR:NORTHERN TELECOM COMPUTERS, INC., A CORP. OF DE.;REEL/FRAME:004006/0654

Effective date: 19871212

Owner name: NORTHERN TELECOM INC. (CHANGED INTO)

Free format text: CERTIFIED COPY OF MERGER FILED IN THE OFFICE OF THE SECRETARY OF STATE OF DELAWARE, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON DEC. 17, 1980, EFFECTIVE DEC. 31, 1980;ASSIGNOR:NORTHERN TELECOM SYSTEMS CORPORATIO A CORP. OF MN. (MERGED INTO);REEL/FRAME:004006/0661

Effective date: 19800918

Owner name: DATA 100 CORPORATION, A MN. CORP. (CHANGED INTO)

Free format text: CERTIFIED COPY OF A CERTIFICATE FILED IN THE OFFICE OF THE SECRETARY OF STATE OF MINNESOTA, SHOWING MERGER OF ASSIGNORS AND CHANGE OF NAME OF THE SURVIVING CORPORATION ON MAY 30, 1979 EFFECTIVE AY 31, 179,;ASSIGNORS:NORTHERN TELECOM COMPUTERS, INC., A CORP. OF DE.;SYCOR, INC. A CORP. OF DE. (MERGED INTO);REEL/FRAME:004006/0654;SIGNING DATES FROM

AS Assignment

Owner name: DATA 100 CORPORATION, A MN CORP., STATELESS

Free format text: ASSIGNS NUNC PRO TUNC AS OF DECEMBER 31, 1977 THE ENTIRE INTEREST IN SAID PATENTS;ASSIGNOR:IOMEC, INC., A CORP. OF DE;REEL/FRAME:004064/0072

Effective date: 19820902

Owner name: DATA 100 CORPORATION, A MN CORP.

Free format text: ASSIGNS NUNC PRO TUNC AS OF DECEMBER 31, 1977 THE ENTIRE INTEREST IN SAID PATENTS.;ASSIGNOR:IOMEC, INC., A CORP. OF DE;REEL/FRAME:004064/0072

Effective date: 19820902